{"id":1479,"date":"2021-07-23T11:08:37","date_gmt":"2021-07-23T05:38:37","guid":{"rendered":"http:\/\/ncertsolutions.guru\/?p=1479"},"modified":"2021-07-23T12:13:03","modified_gmt":"2021-07-23T06:43:03","slug":"ncert-solutions-for-class-9-science-chapter-4-hindi","status":"publish","type":"post","link":"https:\/\/ncertsolutions.guru\/ncert-solutions-for-class-9-science-chapter-4-hindi\/","title":{"rendered":"NCERT Solutions for Class 9 Science Chapter 4 Structure of the Atom (Hindi Medium)"},"content":{"rendered":"<h2><span style=\"color: #00ccff;\">NCERT Solutions for Class 9 Science Chapter 4 Structure of the Atom (Hindi Medium)<\/span><\/h2>\n<p>These Solutions are part of <a href=\"https:\/\/ncertsolutions.guru\/ncert-solutions-for-class-9-science-hindi-medium\/\">NCERT Solutions for Class 9 Science in Hindi Medium<\/a>. Here we have given NCERT Solutions for Class 9 Science Chapter 4 Structure of the Atom.<\/p>\n<p style=\"text-align: center;\"><span style=\"color: #0000ff;\"><strong>\u092a\u093e\u0920\u0917\u0924 \u0939\u0932 \u092a\u094d\u0930\u0936\u094d\u0928 (NCERT IN-TEXT QUESTIONS SOLVED)<\/strong><\/span><\/p>\n<p><strong>NCERT \u092a\u093e\u0920\u094d\u092f\u092a\u0941\u0938\u094d\u0924\u0915 (\u092a\u0943\u0937\u094d\u0920 \u0938\u0902\u0916\u094d\u092f\u093e 53)<\/strong><\/p>\n<p><strong>\u092a\u094d\u0930\u0966 1. \u0915\u0947\u0928\u093e\u0932 \u0915\u093f\u0930\u0923\u0947\u0902 \u0915\u094d\u092f\u093e \u0939\u0948\u0902?<\/strong><br \/>\n<strong>\u0909\u0924\u094d\u0924\u0930-<\/strong> \u0915\u0947\u0928\u093e\u0932 \u0915\u093f\u0930\u0923\u0947\u0902 \u0927\u0928\u093e\u0935\u0947\u0936\u093f\u0924 \u0935\u093f\u0915\u093f\u0930\u0923 \u0939\u0948\u0902 \u091c\u094b \u090f\u0928\u094b\u0921 \u0938\u0947 \u0915\u0948\u0925\u094b\u0921 \u0915\u0940 \u0913\u0930 \u091a\u0932\u0924\u0940 \u0939\u0948\u0902\u0964 \u0907\u0928\u094d\u0939\u0947\u0902 \u090f\u0928\u094b\u0921 \u0915\u093f\u0930\u0923\u0947\u0902 \u092d\u0940 \u0915\u0939\u0924\u0947 \u0939\u0948\u0902\u0964 \u0915\u0947\u0928\u093e\u0932 \u0915\u093f\u0930\u0923\u094b\u0902 \u0915\u0947 \u0915\u093e\u0930\u0923 \u0939\u0940 \u0927\u0928 \u0906\u0935\u0947\u0936\u093f\u0924 \u0905\u0935\u092a\u0930\u092e\u093e\u0923\u0941\u0915 \u0915\u0923 \u092a\u094d\u0930\u094b\u091f\u0949\u0928 \u0915\u0940 \u0916\u094b\u091c \u0939\u0941\u0908\u0964<\/p>\n<p><strong>\u092a\u094d\u0930\u0966 2. \u092f\u0926\u093f \u0915\u093f\u0938\u0940 \u092a\u0930\u092e\u093e\u0923\u0941 \u092e\u0947\u0902 \u090f\u0915 \u0907\u0932\u0947\u0915\u094d\u091f\u094d\u0930\u0949\u0928 \u0914\u0930 \u090f\u0915 \u092a\u094d\u0930\u094b\u091f\u0949\u0928 \u0939\u0948, \u0924\u094b \u0907\u0938\u092e\u0947\u0902 \u0915\u094b\u0908 \u0906\u0935\u0947\u0936 \u0939\u094b\u0917\u093e \u092f\u093e \u0928\u0939\u0940\u0902?<\/strong><br \/>\n<strong>\u0909\u0924\u094d\u0924\u0930-<\/strong> \u0939\u092e \u091c\u093e\u0928\u0924\u0947 \u0939\u0948\u0902 \u0915\u093f \u092a\u094d\u0930\u0924\u094d\u092f\u0947\u0915 \u0907\u0932\u0947\u0915\u094d\u091f\u094d\u0930\u0949\u0928 \u092a\u0930 1 \u0907\u0915\u093e\u0908 \u090b\u0923 \u0906\u0935\u0947\u0936 \u0914\u0930 \u092a\u094d\u0930\u0924\u094d\u092f\u0947\u0915 \u092a\u094d\u0930\u094b\u091f\u0949\u0928 \u092a\u0930 1 \u0907\u0915\u093e\u0908 \u0927\u0928 \u0906\u0935\u0947\u0936 \u0939\u094b\u0924\u093e \u0939\u0948\u0964 \u0907\u0938\u0932\u093f\u090f \u0906\u0935\u0947\u0936 \u0915\u0940 \u0938\u0902\u0916\u094d\u092f\u093e \u0938\u092e\u093e\u0928 \u092a\u0930\u0902\u0924\u0941 \u0935\u093f\u092a\u0930\u0940\u0924 \u0939\u094b\u0928\u0947 \u0915\u0947 \u0915\u093e\u0930\u0923 \u092a\u0930\u092e\u093e\u0923\u0941 \u092a\u0930 \u0915\u094b\u0908 \u0906\u0935\u0947\u0936 \u0928\u0939\u0940\u0902 \u0939\u094b\u0924\u093e \u0914\u0930 \u0935\u0947 \u0909\u0926\u093e\u0938\u0940\u0928 \u0939\u094b\u0924\u0947 \u0939\u0948\u0902\u0964<\/p>\n<p><strong>NCERT \u092a\u093e\u0920\u094d\u092f\u092a\u0941\u0938\u094d\u0924\u0915 (\u092a\u0943\u0937\u094d\u0920 \u0938\u0902\u0916\u094d\u092f\u093e 56)<\/strong><\/p>\n<p><strong>\u092a\u094d\u0930\u0966 1. \u092a\u0930\u092e\u093e\u0923\u0941 \u0909\u0926\u093e\u0938\u0940\u0928 \u0939\u0948, \u0907\u0938 \u0924\u0925\u094d\u092f \u0915\u094b \u091f\u0949\u092e\u0938\u0928 \u0915\u0947 \u092e\u0949\u0921\u0932 \u0915\u0947 \u0906\u0927\u093e\u0930 \u092a\u0930 \u0938\u094d\u092a\u0937\u094d\u091f \u0915\u0940\u091c\u093f\u090f\u0964<\/strong><br \/>\n<strong>\u0909\u0924\u094d\u0924\u0930-<\/strong> \u091f\u0949\u092e\u0938\u0928 \u092e\u0949\u0921\u0932 \u0915\u0947 \u0905\u0928\u0941\u0938\u093e\u0930\u0903<br \/>\n(i) \u092a\u0930\u092e\u093e\u0923\u0941 \u0927\u0928 \u0906\u0935\u0947\u0936\u093f\u0924 \u0917\u094b\u0932\u0947 \u0915\u093e \u092c\u0928\u093e \u0939\u094b\u0924\u093e \u0939\u0948\u0964 \u0914\u0930 \u0907\u0932\u0947\u0915\u094d\u091f\u094d\u0930\u0949\u0928 \u0909\u0938\u092e\u0947\u0902 \u092b\u0901\u0938\u0947 \u0939\u094b\u0924\u0947 \u0939\u0948\u0902\u0964<br \/>\n(ii) \u090b\u0923\u093e\u0924\u094d\u092e\u0915 \u0914\u0930 \u0927\u0928\u093e\u0924\u094d\u092e\u0915 \u0906\u0935\u0947\u0936 \u092a\u0930\u093f\u092e\u093e\u0923 \u092e\u0947\u0902 \u0938\u092e\u093e\u0928 \u0939\u094b\u0924\u0947 \u0939\u0948\u0902\u0964 \u0907\u0938\u0932\u093f\u090f \u092a\u0930\u092e\u093e\u0923\u0941 \u0935\u0948\u0926\u094d\u092f\u0941\u0924\u0940\u092f \u0930\u0942\u092a \u0938\u0947 \u0909\u0926\u093e\u0938\u0940\u0928 \u0939\u094b\u0924\u0947 \u0939\u0948\u0902\u0964<\/p>\n<p><strong>\u092a\u094d\u0930\u0966 2. \u0930\u0926\u0930\u092b\u093c\u094b\u0930\u094d\u0921 \u0915\u0947 \u092a\u0930\u092e\u093e\u0923\u0941 \u092e\u0949\u0921\u0932 \u0915\u0947 \u0905\u0928\u0941\u0938\u093e\u0930, \u092a\u0930\u092e\u093e\u0923\u0941 \u0915\u0947 \u0928\u093e\u092d\u093f\u0915 \u092e\u0947\u0902 \u0915\u094c\u0928-\u0938\u093e \u0905\u0935\u092a\u0930\u092e\u093e\u0923\u0941\u0915 \u0915\u0923 \u0935\u093f\u0926\u094d\u092f\u092e\u093e\u0928 \u0939\u0948?<\/strong><br \/>\n<strong>\u0909\u0924\u094d\u0924\u0930-<\/strong> \u0930\u0926\u0930\u092b\u093c\u094b\u0930\u094d\u0921 \u0915\u0947 \u092a\u0930\u092e\u093e\u0923\u0941 \u092e\u0949\u0921\u0932 \u0915\u0947 \u0905\u0928\u0941\u0938\u093e\u0930 \u092a\u0930\u092e\u093e\u0923\u0941 \u0915\u093e \u0915\u0947\u0902\u0926\u094d\u0930 \u0927\u0928\u093e\u0935\u0947\u0936\u093f\u0924 \u0939\u094b\u0924\u093e \u0939\u0948, \u091c\u093f\u0938\u0947 \u0928\u093e\u092d\u093f\u0915 \u0915\u0939\u093e \u091c\u093e\u0924\u093e \u0939\u0948\u0964 \u0907\u0938\u0932\u093f\u090f \u0928\u093e\u092d\u093f\u0915 \u092e\u0947\u0902 \u0905\u0935\u092a\u0930\u092e\u093e\u0923\u0941\u0915 \u0915\u0923 \u092a\u094d\u0930\u094b\u091f\u0949\u0928 \u0935\u093f\u0926\u094d\u092f\u092e\u093e\u0928 \u0939\u094b\u0924\u0947 \u0939\u0948\u0902 \u0915\u094d\u092f\u094b\u0902\u0915\u093f \u092a\u094d\u0930\u094b\u091f\u0949\u0928 \u0927\u0928\u093e\u0935\u0947\u0936\u093f\u0924 \u0939\u094b\u0924\u093e \u0939\u0948\u0964<\/p>\n<p><strong>\u092a\u094d\u0930\u0966 3. \u0924\u0940\u0928 \u0915\u0915\u094d\u0937\u093e\u0913\u0902 \u0935\u093e\u0932\u0947 \u092c\u094b\u0930 \u0915\u0947 \u092a\u0930\u092e\u093e\u0923\u0941 \u092e\u0949\u0921\u0932 \u0915\u093e \u091a\u093f\u0924\u094d\u0930 \u092c\u0928\u093e\u0907\u090f\u0964<\/strong><br \/>\n<strong>\u0909\u0924\u094d\u0924\u0930-<\/strong><br \/>\n<img loading=\"lazy\" src=\"https:\/\/i0.wp.com\/farm1.staticflickr.com\/852\/43881017621_447b2b4eb3_o.png?resize=311%2C190&#038;ssl=1\" alt=\"NCERT Solutions for Class 9 Science Chapter 4 (Hindi Medium) 1\" width=\"311\" height=\"190\" data-recalc-dims=\"1\" \/><\/p>\n<p><strong>\u092a\u094d\u0930\u0966 4. \u0915\u094d\u092f\u093e \u0905\u0932\u094d\u092b\u093e \u0915\u0923\u094b\u0902 \u0915\u093e \u092a\u094d\u0930\u0915\u0940\u0930\u094d\u0923\u0928 \u092a\u094d\u0930\u092f\u094b\u0917 \u0938\u094b\u0928\u0947 \u0915\u0947 \u0905\u0924\u093f\u0930\u093f\u0915\u094d\u0924 \u0926\u0942\u0938\u0930\u0940 \u0927\u093e\u0924\u0941 \u0915\u0940 \u092a\u0928\u094d\u0928\u0940 \u0938\u0947 \u0938\u0902\u092d\u0935 \u0939\u094b\u0917\u093e?<\/strong><br \/>\n<strong>\u0909\u0924\u094d\u0924\u0930-<\/strong> \u0939\u093e\u0901, 7-\u0915\u0923\u094b\u0902 \u0915\u093e \u092a\u094d\u0930\u0915\u0940\u0930\u094d\u0923\u0928 \u0915\u093f\u0938\u0940 \u092d\u0940 \u0927\u093e\u0924\u0941 \u0915\u0940 \u092a\u0928\u094d\u0928\u0940 \u0938\u0947 \u0938\u0902\u092d\u0935 \u0939\u0948 \u0914\u0930 \u092a\u0930\u093f\u0923\u093e\u092e \u0935\u0939\u0940 \u092a\u094d\u0930\u093e\u092a\u094d\u0924 \u0939\u094b\u0917\u093e \u0915\u094d\u092f\u094b\u0902\u0915\u093f \u0938\u092d\u0940 \u0927\u093e\u0924\u0941\u0913\u0902 \u0915\u0947 \u092a\u0930\u092e\u093e\u0923\u0941\u0913\u0902 \u0915\u0940 \u0938\u0902\u0930\u091a\u0928\u093e \u090f\u0915 \u091c\u0948\u0938\u0940 \u0939\u094b\u0924\u0940 \u0939\u0948\u0964<\/p>\n<p><strong>NCERT \u092a\u093e\u0920\u094d\u092f\u092a\u0941\u0938\u094d\u0924\u0915 (\u092a\u0943\u0937\u094d\u0920 \u0938\u0902\u0916\u094d\u092f\u093e 56)<\/strong><\/p>\n<p><strong>\u092a\u094d\u0930\u0966 1. \u092a\u0930\u092e\u093e\u0923\u0941 \u0915\u0947 \u0924\u0940\u0928 \u0905\u0935\u092a\u0930\u092e\u093e\u0923\u0941\u0915 \u0915\u0923\u094b\u0902 \u0915\u0947 \u0928\u093e\u092e \u0932\u093f\u0916\u0947\u0902\u0964<\/strong><br \/>\n<strong>\u0909\u0924\u094d\u0924\u0930-<\/strong> \u092a\u0930\u092e\u093e\u0923\u0941 \u0915\u0947 \u0924\u0940\u0928 \u0905\u0935\u092a\u0930\u092e\u093e\u0923\u0941\u0915 \u0915\u0923\u094b\u0902 \u0915\u0947 \u0928\u093e\u092e \u0939\u0948\u0902<br \/>\n(i) \u0907\u0932\u0947\u0915\u094d\u091f\u094d\u0930\u0949\u0928<br \/>\n(ii) \u092a\u094d\u0930\u094b\u091f\u0949\u0928<br \/>\n(iii) \u0928\u094d\u092f\u0942\u091f\u094d\u0930\u0949\u0928<\/p>\n<p><strong>\u092a\u094d\u0930\u0966 2. \u0939\u0940\u0932\u093f\u092f\u092e \u092a\u0930\u092e\u093e\u0923\u0941 \u0915\u093e \u092a\u0930\u092e\u093e\u0923\u0941 \u0926\u094d\u0930\u0935\u094d\u092f\u092e\u093e\u0928 4u \u0939\u0948 \u0914\u0930 \u0909\u0938\u0915\u0947 \u0928\u093e\u092d\u093f\u0915 \u092e\u0947\u0902 \u0926\u094b \u092a\u094d\u0930\u094b\u091f\u0949\u0928 \u0939\u094b\u0924\u0947 \u0939\u0948\u0902\u0964 \u0907\u0938\u092e\u0947\u0902 \u0915\u093f\u0924\u0928\u0947 \u0928\u094d\u092f\u0942\u091f\u094d\u0930\u0949\u0928 \u0939\u094b\u0902\u0917\u0947?<\/strong><br \/>\n<strong>\u0909\u0924\u094d\u0924\u0930-<\/strong> \u0939\u0940\u0932\u093f\u092f\u092e (He) \u0915\u093e \u092a\u0930\u092e\u093e\u0923\u0941 \u0926\u094d\u0930\u0935\u094d\u092f\u092e\u093e\u0928 = 4u<br \/>\n\u092a\u0930\u092e\u093e\u0923\u0941 \u0926\u094d\u0930\u0935\u094d\u092f\u092e\u093e\u0928 = \u0928\u094d\u092f\u0942\u091f\u094d\u0930\u0949\u0928 \u0915\u0940 \u0938\u0902\u0916\u094d\u092f\u093e + \u092a\u094d\u0930\u094b\u091f\u0949\u0928 \u0915\u0940 \u0938\u0902\u0916\u094d\u092f\u093e<br \/>\n4 = \u0928\u094d\u092f\u0942\u091f\u094d\u0930\u0949\u0928 \u0915\u0940 \u0938\u0902\u0916\u094d\u092f\u093e + 2<br \/>\n\u0907\u0938\u0932\u093f\u090f, \u0928\u094d\u092f\u0942\u091f\u094d\u0930\u0949\u0928 \u0915\u0940 \u0938\u0902\u0916\u094d\u092f\u093e = 4 &#8211; 2 = 2<br \/>\n\u0905\u0924: \u0939\u0940\u0932\u093f\u092f\u092e \u092a\u0930\u092e\u093e\u0923\u0941 \u092e\u0947\u0902 \u0928\u094d\u092f\u0942\u091f\u094d\u0930\u0949\u0928\u094b\u0902 \u0915\u0940 \u0938\u0902\u0916\u094d\u092f\u093e = 2 \u0939\u0948\u0964<\/p>\n<p><strong>NCERT \u092a\u093e\u0920\u094d\u092f\u092a\u0941\u0938\u094d\u0924\u0915 (\u092a\u0943\u0937\u094d\u0920 \u0938\u0902\u0916\u094d\u092f\u093e 57)<\/strong><\/p>\n<p><strong>\u092a\u094d\u0930\u0966 1. \u0915\u093e\u0930\u094d\u092c\u0928 \u0914\u0930 \u0938\u094b\u0921\u093f\u092f\u092e \u0915\u0947 \u092a\u0930\u092e\u093e\u0923\u0941\u0913\u0902 \u0915\u0947 \u0932\u093f\u090f \u0907\u0932\u0947\u0915\u094d\u091f\u094d\u0930\u0949\u0928-\u0935\u093f\u0924\u0930\u0923 \u0932\u093f\u0916\u093f\u090f\u0964<\/strong><br \/>\n<strong>\u0909\u0924\u094d\u0924\u0930-<\/strong> \u0915\u093e\u0930\u094d\u092c\u0928 \u092a\u0930\u092e\u093e\u0923\u0941 \u0938\u0902\u0916\u094d\u092f\u093e = 6<br \/>\n\u092a\u094d\u0930\u094b\u091f\u0949\u0928\u094b\u0902 \u0915\u0940 \u0938\u0902\u0916\u094d\u092f\u093e = 6<br \/>\n\u092a\u094d\u0930\u094b\u091f\u0949\u0928\u094b\u0902 \u0915\u0940 \u0938\u0902\u0916\u094d\u092f\u093e = \u0907\u0932\u0947\u0915\u094d\u091f\u094d\u0930\u0949\u0928\u094b\u0902 \u0915\u0940 \u0938\u0902\u0916\u094d\u092f\u093e = 6<br \/>\n\u0907\u0932\u0947\u0915\u094d\u091f\u094d\u0930\u0949\u0928 &#8211; \u0935\u093f\u0924\u0930\u0923\u0903<br \/>\nK 2<br \/>\nL 4<br \/>\n\u0938\u094b\u0921\u093f\u092f\u092e \u092a\u0930\u092e\u093e\u0923\u0941 \u0938\u0902\u0916\u094d\u092f\u093e = 11<br \/>\n\u092a\u094d\u0930\u094b\u091f\u0949\u0928\u094b\u0902 \u0915\u0940 \u0938\u0902\u0916\u094d\u092f\u093e = \u0907\u0932\u0947\u0915\u094d\u091f\u094d\u0930\u0949\u0928\u094b\u0902 \u0915\u0940 \u0938\u0902\u0916\u094d\u092f\u093e = 11<br \/>\n\u0907\u0932\u0947\u0915\u094d\u091f\u094d\u0930\u0949\u0928 &#8211; \u0935\u093f\u0924\u0930\u0923\u0903<br \/>\nK L M<br \/>\n2 8 1<\/p>\n<p><strong>\u092a\u094d\u0930\u0966 2. \u0905\u0917\u0930 \u0915\u093f\u0938\u0940 \u092a\u0930\u092e\u093e\u0923\u0941 \u0915\u093e K \u0914\u0930 L \u0915\u094b\u0936 \u092d\u0930\u093e \u0939\u0948 \u0924\u094b \u0909\u0938 \u092a\u0930\u092e\u093e\u0923\u0941 \u092e\u0947\u0902 \u0907\u0932\u0947\u0915\u094d\u091f\u094d\u0930\u0949\u0928\u094b\u0902 \u0915\u0940 \u0938\u0902\u0916\u094d\u092f\u093e \u0915\u094d\u092f\u093e \u0939\u094b\u0917\u0940?<\/strong><br \/>\n<strong>\u0909\u0924\u094d\u0924\u0930-<\/strong> K \u0915\u094b\u0936 \u092e\u0947\u0902 \u0905\u0927\u093f\u0915\u0924\u092e 2 \u0924\u0925\u093e L \u0915\u094b\u0936 \u092e\u0947\u0902 \u0905\u0927\u093f\u0915\u0924\u092e 8 \u0907\u0932\u0947\u0915\u094d\u091f\u094d\u0930\u0949\u0928 \u0930\u0939 \u0938\u0915\u0924\u0947 \u0939\u0948\u0902\u0964 \u091a\u0942\u0902\u0915\u093f \u092f\u0947 \u0926\u094b\u0928\u094b\u0902 \u0915\u094b\u0936 \u092d\u0930\u0947 \u0939\u0948\u0902\u0964<br \/>\n\u0907\u0938\u0932\u093f\u090f \u0907\u0938 \u092a\u0930\u092e\u093e\u0923\u0941 \u092e\u0947\u0902 \u0907\u0932\u0947\u0915\u094d\u091f\u094d\u0930\u093e\u0928\u094b\u0902 \u0915\u0940 \u0915\u0941\u0932 \u0938\u0902\u0916\u094d\u092f\u093e = 2 + 8 = 10 \u0939\u094b\u0917\u0940\u0964<\/p>\n<p><strong>NCERT \u092a\u093e\u0920\u094d\u092f\u092a\u0941\u0938\u094d\u0924\u0915 (\u092a\u0943\u0937\u094d\u0920 \u0938\u0902\u0916\u094d\u092f\u093e 58)<\/strong><\/p>\n<p><strong>\u092a\u094d\u0930\u0966 1. \u0915\u094d\u0932\u094b\u0930\u0940\u0928, \u0938\u0932\u094d\u092b\u0930 \u0914\u0930 \u092e\u0948\u0917\u094d\u0928\u0940\u0936\u093f\u092f\u092e \u0915\u0940 \u092a\u0930\u092e\u093e\u0923\u0941 \u0938\u0902\u0916\u094d\u092f\u093e \u0938\u0947 \u0906\u092a \u0907\u0938\u0915\u0940 \u0938\u0902\u092f\u094b\u091c\u0915\u0924\u093e \u0915\u0948\u0938\u0947 \u092a\u094d\u0930\u093e\u092a\u094d\u0924 \u0915\u0930\u0947\u0902\u0917\u0947?<\/strong><br \/>\n<strong>\u0909\u0924\u094d\u0924\u0930-<\/strong> \u0939\u092e \u091c\u093e\u0928\u0924\u0947 \u0939\u0948\u0902 \u0915\u093f \u092a\u0930\u092e\u093e\u0923\u0941 \u0915\u0947 \u092c\u093e\u0939\u094d\u092f\u0924\u092e \u0915\u0915\u094d\u0937 \u092e\u0947\u0902 \u0905\u0937\u094d\u091f\u0915 \u092c\u0928\u093e\u0928\u0947 \u0915\u0947 \u0932\u093f\u090f \u091c\u093f\u0924\u0928\u0940 \u0938\u0902\u0916\u094d\u092f\u093e \u092e\u0947\u0902 \u0907\u0932\u0947\u0915\u094d\u091f\u094d\u0930\u0949\u0928\u094b\u0902 \u0915\u0940 \u0938\u093e\u091d\u0947\u0926\u093e\u0930\u0940 \u092f\u093e \u0938\u094d\u0925\u093e\u0928\u093e\u0902\u0924\u0930\u0923 \u0939\u094b\u0924\u093e \u0939\u0948, \u0935\u0939\u0940 \u0909\u0938 \u0924\u0924\u094d\u0924\u094d\u0935 \u0915\u0940 \u0938\u0902\u092f\u094b\u091c\u0915\u0924\u093e-\u0936\u0915\u094d\u0924\u093f \u0905\u0930\u094d\u0925\u093e\u0924\u094d \u0938\u0902\u092f\u094b\u091c\u0915\u0924\u093e \u0939\u094b\u0924\u0940 \u0939\u0948\u0964<br \/>\n(i) \u0915\u094d\u0932\u094b\u0930\u0940\u0928, \u092a\u0930\u092e\u093e\u0923\u0941 \u0938\u0902\u0916\u094d\u092f\u093e = 17<br \/>\n\u092a\u094d\u0930\u094b\u091f\u0949\u0928 = 17, \u0907\u0932\u0947\u0915\u094d\u091f\u094d\u0930\u0949\u0928 = 17<br \/>\n\u0907\u0932\u0947\u0915\u094d\u091f\u094d\u0930\u0949\u0928\u094b\u0902 \u0915\u093e \u0935\u093f\u0924\u0930\u0923\u0903<br \/>\nK L M<br \/>\n2 8 7<br \/>\n\u091a\u0942\u0901\u0915\u093f Cl \u0915\u0947 \u092c\u093e\u0939\u094d\u092f\u0924\u092e \u0915\u094b\u0936 \u092e\u0947\u0902 7 \u0907\u0932\u0947\u0915\u094d\u091f\u094d\u0930\u0949\u0928 \u0939\u0948\u0902\u0964 \u0907\u0938\u0932\u093f\u090f \u0905\u0937\u094d\u091f\u0915 \u092a\u0942\u0930\u094d\u0923 \u0915\u0930\u0928\u0947 \u0915\u0947 \u0932\u093f\u090f 1 \u0907\u0932\u0947\u0915\u094d\u091f\u094d\u0930\u0949\u0928 \u0917\u094d\u0930\u0939\u0923 \u0915\u0930\u0947\u0917\u093e \u0924\u093e\u0915\u093f \u0928\u093f\u0915\u091f\u0924\u092e \u0905\u0915\u094d\u0930\u093f\u092f \u0917\u0948\u0938 \u0907\u0932\u0947\u0915\u094d\u091f\u094d\u0930\u0949\u0928\u093f\u0915 \u0935\u093f\u0928\u094d\u092f\u093e\u0938 \u092a\u094d\u0930\u093e\u092a\u094d\u0924 \u0915\u0930 \u0938\u0915\u0947\u0964<br \/>\nCl \u0915\u0940 \u0938\u0902\u092f\u094b\u091c\u0915\u0924\u093e = 8 &#8211; 7 = 1 \u0939\u0948\u0964<\/p>\n<p>(ii) \u0938\u0932\u094d\u092b\u0930 \u092a\u0930\u092e\u093e\u0923\u0941 \u0938\u0902\u0916\u094d\u092f\u093e = 16<br \/>\n\u0907\u0932\u0947\u0915\u094d\u091f\u094d\u0930\u0949\u0928 16, \u092a\u094d\u0930\u094b\u091f\u0949\u0928 = 16<br \/>\n\u0907\u0932\u0947\u0915\u094d\u091f\u094d\u0930\u0949\u0928\u094b\u0902 \u0915\u093e \u0935\u093f\u0924\u0930\u0923\u0903<br \/>\nK L M<br \/>\n2 8 6<br \/>\n\u0938\u0932\u094d\u092b\u0930 \u0915\u094b \u0905\u0937\u094d\u091f\u0915 \u092a\u0942\u0930\u094d\u0923 \u0915\u0930\u0928\u0947 \u0915\u0947 \u0932\u093f\u090f 2 \u0907\u0932\u0947\u0915\u094d\u091f\u094d\u0930\u0949\u0928\u094b\u0902 \u0915\u0940 \u0906\u0935\u0936\u094d\u092f\u0915\u0924\u093e \u0939\u0948\u0964 \u0938\u0932\u094d\u092b\u0930 2 \u0907\u0932\u0947\u0915\u094d\u091f\u094d\u0930\u0949\u0928 \u0917\u094d\u0930\u0939\u0923 \u0915\u0930 \u0905\u0937\u094d\u091f\u0915 \u092a\u0942\u0930\u094d\u0923 \u0915\u0930\u0947\u0917\u093e\u0964<br \/>\n\u0907\u0938\u0932\u093f\u090f \u0938\u0932\u094d\u092b\u0930 \u0915\u0940 \u0938\u0902\u092f\u094b\u091c\u0915\u0924\u093e = 8 &#8211; 6 = 2<\/p>\n<p>(iii) \u092e\u0948\u0917\u094d\u0928\u0940\u0936\u093f\u092f\u092e, \u092a\u0930\u092e\u093e\u0923\u0941 \u0938\u0902\u0916\u094d\u092f\u093e = 12<br \/>\n\u0907\u0932\u0947\u0915\u094d\u091f\u094d\u0930\u0949\u0928\u094b\u0902 \u0915\u0940 \u0938\u0902\u0916\u094d\u092f\u093e = 12 \u092a\u094d\u0930\u094b\u091f\u0949\u0928\u094b\u0902 \u0915\u0940 \u0938\u0902\u0916\u094d\u092f\u093e = 12<br \/>\n\u0907\u0932\u0947\u0915\u094d\u091f\u094d\u0930\u0949\u0928\u094b\u0902 \u0915\u093e \u0935\u093f\u0924\u0930\u0923\u0903<br \/>\nK L M<br \/>\n2 8 2<br \/>\n\u091a\u0942\u0901\u0915\u093f \u092c\u093e\u0939\u094d\u092f\u0924\u092e \u0915\u094b\u0936 \u092e\u0947\u0902 \u0907\u0932\u0947\u0915\u094d\u091f\u094d\u0930\u0949\u0928\u094b\u0902 \u0915\u0940 \u0938\u0902\u0916\u094d\u092f\u093e 2 \u0939\u0948, \u0907\u0938\u0932\u093f\u090f \u092e\u0948\u0917\u094d\u0928\u0940\u0936\u093f\u092f\u092e 2 \u0907\u0932\u0947\u0915\u094d\u091f\u094d\u0930\u0949\u0928\u094b\u0902 \u0915\u093e \u092a\u0930\u093f\u0924\u094d\u092f\u093e\u0917 \u0915\u0930 \u0905\u0937\u094d\u091f\u0915 \u092a\u0942\u0930\u094d\u0923 \u0915\u0930\u0947\u0902\u0917\u0947\u0964<br \/>\n\u092e\u0948\u0917\u094d\u0928\u0940\u0936\u093f\u092f\u092e \u0915\u0940 \u0938\u0902\u092f\u094b\u091c\u0915\u0924\u093e = 2 \u0939\u0948\u0964<\/p>\n<p><strong>NCERT \u092a\u093e\u0920\u094d\u092f\u092a\u0941\u0938\u094d\u0924\u0915 (\u092a\u0943\u0937\u094d\u0920 \u0938\u0902\u0916\u094d\u092f\u093e 59)<\/strong><\/p>\n<p><strong>\u092a\u094d\u0930\u0966 1. \u092f\u0926\u093f \u0915\u093f\u0938\u0940 \u092a\u0930\u092e\u093e\u0923\u0941 \u092e\u0947\u0902 \u0907\u0932\u0947\u0915\u094d\u091f\u094d\u0930\u0949\u0928\u094b\u0902 \u0915\u0940 \u0938\u0902\u0916\u094d\u092f\u093e 8 \u0939\u0948 \u0914\u0930 \u092a\u094d\u0930\u094b\u091f\u0949\u0928\u094b\u0902 \u0915\u0940 \u0938\u0902\u0916\u094d\u092f\u093e \u092d\u0940 8 \u0939\u0948 \u0924\u092c,<\/strong><br \/>\n<strong>(a) \u092a\u0930\u092e\u093e\u0923\u0941 \u0915\u0940 \u092a\u0930\u092e\u093e\u0923\u0941\u0915 \u0938\u0902\u0916\u094d\u092f\u093e \u0915\u094d\u092f\u093e \u0939\u0948?<\/strong><br \/>\n<strong>(b) \u092a\u0930\u092e\u093e\u0923\u0941\u0915 \u0915\u093e \u0915\u094d\u092f\u093e \u0906\u0935\u0947\u0936 \u0939\u0948?<\/strong><br \/>\n<strong>\u0909\u0924\u094d\u0924\u0930-<\/strong><br \/>\n(a) \u092a\u094d\u0930\u094b\u091f\u0949\u0928\u094b\u0902 \u0915\u0940 \u0938\u0902\u0916\u094d\u092f\u093e = 8<br \/>\n\u092a\u0930\u092e\u093e\u0923\u0941 \u0938\u0902\u0916\u094d\u092f\u093e = \u092a\u094d\u0930\u094b\u091f\u0949\u0928\u094b\u0902 \u0915\u0940 \u0938\u0902\u0916\u094d\u092f\u093e = 8<br \/>\n(b) \u092a\u094d\u0930\u094b\u091f\u0949\u0928\u094b\u0902 \u0915\u0940 \u0938\u0902\u0916\u094d\u092f\u093e = 8<br \/>\n\u0907\u0932\u0947\u0915\u094d\u091f\u094d\u0930\u0949\u0928\u094b\u0902 \u0915\u0940 \u0938\u0902\u0916\u094d\u092f\u093e = 8<br \/>\n\u091a\u0942\u0901\u0915\u093f \u092a\u094d\u0930\u0924\u094d\u092f\u0947\u0915 \u092a\u094d\u0930\u094b\u091f\u0949\u0928 \u0915\u093e \u0906\u0935\u0947\u0936 (+1) \u0914\u0930 \u092a\u094d\u0930\u0924\u094d\u092f\u0947\u0915 \u0907\u0932\u0947\u0915\u094d\u091f\u094d\u0930\u0949\u0928 \u0915\u093e \u0906\u0935\u0947\u0936 (-1) \u0939\u094b\u0924\u093e \u0939\u0948\u0964<br \/>\n\u0928\u0947\u091f \u0906\u0935\u0947\u0936 = (+ 8) + (-8) = 0<br \/>\n\u0905\u0924\u0903 \u092a\u0930\u092e\u093e\u0923\u0941 \u092a\u0930 \u0915\u094b\u0908 \u0906\u0935\u0947\u0936 \u0928\u0939\u0940\u0902 \u0939\u0948\u0964 \u092f\u0939 \u0909\u0926\u093e\u0938\u0940\u0928 \u0939\u0948\u0964<\/p>\n<p><strong>\u092a\u094d\u0930\u0966 2. \u0938\u093e\u0930\u0923\u0940 4.1 \u0915\u0940 \u0938\u0939\u093e\u092f\u0924\u093e \u0938\u0947 \u0911\u0915\u094d\u0938\u0940\u091c\u0928 \u0914\u0930 \u0938\u0932\u094d\u092b\u0930-\u092a\u0930\u092e\u093e\u0923\u0941 \u0915\u0940 \u0926\u094d\u0930\u0935\u094d\u092f\u092e\u093e\u0928 \u0938\u0902\u0916\u094d\u092f\u093e \u091c\u094d\u091e\u093e\u0924 \u0915\u0940\u091c\u093f\u090f\u0964<\/strong><br \/>\n<strong>\u0909\u0924\u094d\u0924\u0930-<\/strong> \u090f\u0915 \u092a\u0930\u092e\u093e\u0923\u0941 \u0915\u0947 \u0928\u093e\u092d\u093f\u0915 \u092e\u0947\u0902 \u0909\u092a\u0938\u094d\u0925\u093f\u0924 \u092a\u094d\u0930\u094b\u091f\u0949\u0928\u094b\u0902 \u0914\u0930 \u0928\u094d\u092f\u0942\u091f\u094d\u0930\u0949\u0928\u094b\u0902 \u0915\u0940 \u0938\u0902\u0916\u094d\u092f\u093e \u0915\u0947 \u092f\u094b\u0917 \u0915\u094b \u0926\u094d\u0930\u0935\u094d\u092f\u092e\u093e\u0928 \u0938\u0902\u0916\u094d\u092f\u093e \u0915\u0939\u093e \u091c\u093e\u0924\u093e \u0939\u0948\u0964<br \/>\n\u0905\u0930\u094d\u0925\u093e\u0924 \u0926\u094d\u0930\u0935\u094d\u092f\u092e\u093e\u0928 \u0938\u0902\u0916\u094d\u092f\u093e = \u092a\u094d\u0930\u094b\u091f\u0949\u0928 \u0915\u0940 \u0938\u0902\u0916\u094d\u092f\u093e + \u0928\u094d\u092f\u0942\u091f\u094d\u0930\u0949\u0928 \u0915\u0940 \u0938\u0902\u0916\u094d\u092f\u093e<br \/>\n\u0911\u0915\u094d\u0938\u0940\u091c\u0928\u0903 \u092a\u094d\u0930\u094b\u091f\u0949\u0928 = 8, \u0928\u094d\u092f\u0942\u091f\u094d\u0930\u0949\u0928 = 8 \u0926\u094d\u0930\u0935\u094d\u092f\u092e\u093e\u0928 \u0938\u0902\u0916\u094d\u092f\u093e = 8 + 8 = 16 u<br \/>\n\u0938\u0932\u094d\u092b\u0930\u0903 \u092a\u094d\u0930\u094b\u091f\u0949\u0928 = 16, \u0928\u094d\u092f\u0942\u091f\u094d\u0930\u0949\u0928 = 16<br \/>\n\u0926\u094d\u0930\u0935\u094d\u092f\u092e\u093e\u0928 \u0938\u0902\u0916\u094d\u092f\u093e = 16 + 16 = 32 u<\/p>\n<p><strong>NCERT \u092a\u093e\u0920\u094d\u092f\u092a\u0941\u0938\u094d\u0924\u0915 (\u092a\u0943\u0937\u094d\u0920 \u0938\u0902\u0916\u094d\u092f\u093e 60)<\/strong><\/p>\n<p><strong>\u092a\u094d\u0930\u0966 1. \u091a\u093f\u0928 H, D \u0914\u0930 T \u0915\u0947 \u0932\u093f\u090f \u092a\u094d\u0930\u0924\u094d\u092f\u0947\u0915 \u092e\u0947\u0902 \u092a\u093e\u090f \u091c\u093e\u0928\u0947 \u0935\u093e\u0932\u0947 \u0924\u0940\u0928 \u0905\u0935\u092a\u0930\u092e\u093e\u0923\u0941\u0915 \u0915\u0923\u094b\u0902 \u0915\u094b \u0938\u093e\u0930\u0923\u0940\u092c\u0926\u094d\u0927 \u0915\u0940\u091c\u093f\u090f\u0964<\/strong><br \/>\n<strong>\u0909\u0924\u094d\u0924\u0930-<\/strong><br \/>\n<img loading=\"lazy\" src=\"https:\/\/i0.wp.com\/farm1.staticflickr.com\/861\/43832745462_4c67a794f6_o.png?resize=545%2C155&#038;ssl=1\" alt=\"NCERT Solutions for Class 9 Science Chapter 4 (Hindi Medium) 2\" width=\"545\" height=\"155\" data-recalc-dims=\"1\" \/><\/p>\n<p><strong>\u092a\u094d\u0930\u0966 2. \u0938\u092e\u0938\u094d\u0925\u093e\u0928\u093f\u0915 \u0914\u0930 \u0938\u092e\u092d\u093e\u0930\u093f\u0915 \u0915\u0947 \u0915\u093f\u0938\u0940 \u090f\u0915 \u092f\u0941\u0917\u094d\u092e \u0915\u093e \u0907\u0932\u0947\u0915\u094d\u091f\u094d\u0930\u0949\u0928\u093f\u0915 \u0935\u093f\u0928\u094d\u092f\u093e\u0938 \u0932\u093f\u0916\u093f\u090f\u0964<\/strong><br \/>\n<strong>\u0909\u0924\u094d\u0924\u0930-<\/strong> \u0938\u092e\u0938\u094d\u0925\u093e\u0928\u093f\u0915 (Isotopes) \u090f\u0915 \u0939\u0940 \u0924\u0924\u094d\u0924\u094d\u0935 \u0915\u0947 \u092a\u0930\u092e\u093e\u0923\u0941 \u0939\u094b\u0924\u0947 \u0939\u0948\u0902, \u091c\u093f\u0928\u0915\u0940 \u0926\u094d\u0930\u0935\u094d\u092f\u092e\u093e\u0928 \u0938\u0902\u0916\u094d\u092f\u093e \u092d\u093f\u0928\u094d\u0928-\u092d\u093f\u0928\u094d\u0928 \u092a\u0930\u0902\u0924\u0941 \u092a\u0930\u092e\u093e\u0923\u0941 \u0938\u0902\u0916\u094d\u092f\u093e \u0938\u092e\u093e\u0928 \u0939\u094b\u0924\u0940 \u0939\u0948\u0964 \u0907\u0938\u0932\u093f\u090f \u0938\u092e\u0938\u094d\u0925\u093e\u0928\u093f\u0915\u094b\u0902 \u0915\u0947 \u0907\u0932\u0947\u0915\u094d\u091f\u094d\u0930\u0949\u0928\u093f\u0915 \u0935\u093f\u0928\u094d\u092f\u093e\u0938 \u092d\u0940 \u0938\u092e\u093e\u0928 \u0939\u0940 \u0930\u0939\u0924\u0947 \u0939\u0948\u0902\u0964<br \/>\n<img loading=\"lazy\" src=\"https:\/\/i2.wp.com\/farm1.staticflickr.com\/929\/43832745942_360146727f_o.png?resize=334%2C141&#038;ssl=1\" alt=\"NCERT Solutions for Class 9 Science Chapter 4 (Hindi Medium) 3\" width=\"334\" height=\"141\" data-recalc-dims=\"1\" \/><br \/>\n[\u0928\u094d\u092f\u0942\u091f\u094d\u0930\u0949\u0928 = \u0926\u094d\u0930\u0935\u094d\u092f\u092e\u093e\u0928 \u0938\u0902\u0916\u094d\u092f\u093e &#8211; \u092a\u094d\u0930\u094b\u091f\u0949\u0928]<br \/>\n\u0938\u092e\u092d\u093e\u0930\u093f\u0915 (Isobars) &#8211; \u0905\u0932\u0917-\u0905\u0932\u0917 \u0924\u0924\u094d\u0924\u094d\u0935\u094b\u0902 \u0915\u0947 \u092a\u0930\u092e\u093e\u0923\u0941, \u091c\u093f\u0928\u0915\u0940 \u0926\u094d\u0930\u0935\u094d\u092f\u092e\u093e\u0928 \u0938\u0902\u0916\u094d\u092f\u093e \u0938\u092e\u093e\u0928 \u0932\u0947\u0915\u093f\u0928 \u092a\u0930\u092e\u093e\u0923\u0941 \u0938\u0902\u0916\u094d\u092f\u093e \u092d\u093f\u0928\u094d\u0928-\u092d\u093f\u0928\u094d\u0928 \u0939\u094b\u0924\u0940 \u0939\u0948, \u0938\u092e\u092d\u093e\u0930\u093f\u0915 \u0915\u0939\u0932\u093e\u0924\u0947 \u0939\u0948\u0902\u0964<br \/>\n<img loading=\"lazy\" src=\"https:\/\/i2.wp.com\/farm1.staticflickr.com\/937\/43832746232_8a04f3029c_o.png?resize=301%2C212&#038;ssl=1\" alt=\"NCERT Solutions for Class 9 Science Chapter 4 (Hindi Medium) 4\" width=\"301\" height=\"212\" data-recalc-dims=\"1\" \/><\/p>\n<p style=\"text-align: center;\"><span style=\"color: #0000ff;\"><strong>\u092a\u093e\u0920\u094d\u092f\u092a\u0941\u0938\u094d\u0924\u0915 \u0938\u0947 \u0939\u0932 \u092a\u094d\u0930\u0936\u094d\u0928 (NCERT TEXTBOOK QUESTIONS SOLVED)<\/strong><\/span><\/p>\n<p><strong>\u092a\u094d\u0930\u0966 1. \u0907\u0932\u0947\u0915\u094d\u091f\u094d\u0930\u0949\u0928, \u092a\u094d\u0930\u094b\u091f\u0949\u0928 \u0914\u0930 \u0928\u094d\u092f\u0942\u091f\u094d\u0930\u0949\u0928 \u0915\u0947 \u0917\u0941\u0923\u094b\u0902 \u0915\u0940 \u0924\u0941\u0932\u0928\u093e \u0915\u0940\u091c\u093f\u090f\u0964<\/strong><br \/>\n<strong>\u0909\u0924\u094d\u0924\u0930-<\/strong><br \/>\n<img loading=\"lazy\" src=\"https:\/\/i1.wp.com\/farm2.staticflickr.com\/1778\/43832746632_af0c6cfa9e_o.png?resize=619%2C70&#038;ssl=1\" alt=\"NCERT Solutions for Class 9 Science Chapter 4 (Hindi Medium) 5\" width=\"619\" height=\"70\" data-recalc-dims=\"1\" \/><br \/>\n<img loading=\"lazy\" src=\"https:\/\/i0.wp.com\/farm1.staticflickr.com\/928\/43832747362_7ec5b12811_o.png?resize=628%2C275&#038;ssl=1\" alt=\"NCERT Solutions for Class 9 Science Chapter 4 (Hindi Medium) 6\" width=\"628\" height=\"275\" data-recalc-dims=\"1\" \/><\/p>\n<p><strong>\u092a\u094d\u0930\u0966 2. \u091c\u0947\u0966\u091c\u0947\u0966 \u091f\u0949\u092e\u0938\u0928 \u0915\u0947 \u092a\u0930\u092e\u093e\u0923\u0941 \u092e\u0949\u0921\u0932 \u0915\u0940 \u0915\u094d\u092f\u093e \u0938\u0940\u092e\u093e\u090f\u0901 \u0939\u0948\u0902?<\/strong><br \/>\n<strong>\u0909\u0924\u094d\u0924\u0930-<\/strong> \u091c\u0947\u0966\u091c\u0947\u0966 \u091f\u0949\u092e\u0938\u0928 \u0915\u0947 \u092e\u0949\u0921\u0932 \u0938\u0947 \u092a\u0930\u092e\u093e\u0923\u0941 \u0915\u0947 \u0909\u0926\u093e\u0938\u0940\u0928 \u0939\u094b\u0928\u0947 \u0915\u0940 \u0935\u094d\u092f\u093e\u0916\u094d\u092f\u093e \u0939\u0941\u0908, \u092a\u0930\u0902\u0924\u0941 \u0926\u0942\u0938\u0930\u0947 \u0935\u0948\u091c\u094d\u091e\u093e\u0928\u093f\u0915\u094b\u0902 \u0926\u094d\u0935\u093e\u0930\u093e \u0915\u093f\u090f \u0917\u090f \u092a\u094d\u0930\u092f\u094b\u0917\u094b\u0902 \u0915\u0947 \u092a\u0930\u093f\u0923\u093e\u092e\u094b\u0902 \u0915\u094b \u0907\u0938 \u092e\u0949\u0921\u0932 \u0915\u0947 \u0926\u094d\u0935\u093e\u0930\u093e \u0938\u092e\u091d\u093e\u092f\u093e \u0928\u0939\u0940\u0902 \u091c\u093e \u0938\u0915\u093e\u0964<\/p>\n<p>\u091c\u0948\u0938\u0947 &#8211; \u0930\u0926\u0930\u092b\u093c\u094b\u0930\u094d\u0921 \u0915\u0947 \u03b1 &#8211; \u0915\u0923 \u092a\u094d\u0930\u0915\u0940\u0930\u094d\u0923\u0928 \u092a\u094d\u0930\u092f\u094b\u0917 \u092e\u0947\u0902 \u091c\u094d\u092f\u093e\u0926\u093e\u0924\u0930 \u0905\u0932\u094d\u092b\u093e-\u0915\u0923 \u0938\u0940\u0927\u0947 \u0915\u094d\u092f\u094b\u0902 \u0928\u093f\u0915\u0932 \u0917\u090f, \u0915\u0941\u091b \u0905\u0932\u094d\u092b\u093e-\u0915\u0923 \u092c\u0939\u0941\u0924 \u091b\u094b\u091f\u0947 \u0915\u094b\u0923 \u0938\u0947 \u0915\u094d\u092f\u094b\u0902 \u0935\u093f\u0915\u094d\u0937\u0947\u092a\u093f\u0924 \u0939\u0941\u090f \u0914\u0930 \u092c\u0939\u0941\u0924 \u0915\u092e \u0915\u0923 \u0935\u093e\u092a\u0938 \u0915\u094d\u092f\u094b\u0902 \u0906 \u0917\u090f? \u0907\u0928 \u092a\u094d\u0930\u0936\u094d\u0928\u094b\u0902 \u0915\u0940 \u0935\u094d\u092f\u093e\u0916\u094d\u092f\u093e \u0915\u0930\u0928\u0947 \u092e\u0947\u0902 \u092f\u0939 \u092e\u0949\u0921\u0932 \u0905\u0938\u092b\u0932 \u0930\u0939\u093e\u0964<\/p>\n<p><strong>\u092a\u094d\u0930\u0966 3. \u0930\u0926\u0930\u092b\u093c\u094b\u0930\u094d\u0921 \u092a\u0930\u092e\u093e\u0923\u0941 \u092e\u0949\u0921\u0932 \u0915\u0940 \u0915\u094d\u092f\u093e \u0938\u0940\u092e\u093e\u090f\u0901 \u0939\u0948\u0902?<\/strong><br \/>\n<strong>\u0909\u0924\u094d\u0924\u0930-<\/strong> \u092f\u0926\u093f \u0915\u094b\u0908 \u092d\u0940 \u0906\u0935\u0947\u0936\u093f\u0924 \u0915\u0923 \u0917\u094b\u0932\u093e\u0915\u093e\u0930 \u0915\u0915\u094d\u0937 \u092e\u0947\u0902 \u0924\u094d\u0935\u0930\u093f\u0924<br \/>\n\u0939\u094b\u0917\u093e \u0924\u094b \u0906\u0935\u0947\u0936\u093f\u0924 \u0915\u0923\u094b\u0902 \u0938\u0947 \u090a\u0930\u094d\u091c\u093e \u0915\u093e \u0935\u093f\u0915\u093f\u0930\u0923 \u0939\u094b\u0917\u093e, \u091c\u093f\u0938\u0938\u0947 \u0907\u0938\u0915\u0940 \u090a\u0930\u094d\u091c\u093e \u0928\u093f\u0930\u0902\u0924\u0930 \u0918\u091f\u0924\u0940 \u091c\u093e\u090f\u0917\u0940 \u0914\u0930 \u0907\u0938\u0915\u0940 \u0917\u0924\u093f \u092d\u0940 \u0915\u092e \u0939\u094b\u0924\u0940 \u091c\u093e\u090f\u0917\u0940\u0964 \u0905\u0902\u0924\u0924\u0903 \u0938\u094d\u0925\u093e\u092f\u0940 \u0915\u0915\u094d\u0937 \u092e\u0947\u0902 \u0918\u0942\u092e\u0924\u093e \u0939\u0941\u0906 \u0907\u0932\u0947\u0915\u094d\u091f\u094d\u0930\u0949\u0928 \u090f\u0915 \u0938\u0930\u094d\u092a\u093f\u0932 (Spiral) \u092a\u0925 \u0915\u093e \u0928\u093f\u0930\u094d\u092e\u093e\u0923 \u0915\u0930 \u0928\u093e\u092d\u093f\u0915 \u0938\u0947 \u091f\u0915\u0930\u093e \u091c\u093e\u090f\u0917\u093e\u0964 \u0905\u0917\u0930 \u0910\u0938\u093e \u0939\u094b\u0924\u093e, \u0924\u094b \u092a\u0930\u092e\u093e\u0923\u0941 \u0905\u0938\u094d\u0925\u093f\u0930 \u0939\u094b\u0924\u093e \u091c\u092c\u0915\u093f \u0939\u092e \u091c\u093e\u0928\u0924\u0947 \u0939\u0948\u0902\u0964 \u0915\u093f \u092a\u0930\u092e\u093e\u0923\u0941 \u0938\u094d\u0925\u093e\u092f\u0940 \u0939\u094b\u0924\u0947 \u0939\u0948\u0902\u0964 \u092a\u0930\u092e\u093e\u0923\u0941 \u0938\u092e\u093e\u092a\u094d\u0924 \u092f\u093e \u0928\u0937\u094d\u091f \u0928\u0939\u0940\u0902 \u0939\u094b\u0924\u0947\u0964<\/p>\n<p>\u0905\u0924\u0903 \u0930\u0926\u0930\u092b\u093c\u094b\u0930\u094d\u0921 \u0915\u093e \u092a\u0930\u092e\u093e\u0923\u0941 \u092e\u0949\u0921\u0932 \u092a\u0930\u092e\u093e\u0923\u0941 \u0915\u0947 \u0938\u094d\u0925\u093e\u092f\u093f\u0924\u094d\u0935 \u0915\u0940 \u0935\u094d\u092f\u093e\u0916\u094d\u092f\u093e \u0915\u0930 \u092a\u093e\u0928\u0947 \u092e\u0947\u0902 \u0905\u0938\u092b\u0932 \u0930\u0939\u093e\u0964<br \/>\n<img loading=\"lazy\" src=\"https:\/\/i2.wp.com\/farm1.staticflickr.com\/848\/43881019401_bdb191809b_o.png?resize=222%2C159&#038;ssl=1\" alt=\"NCERT Solutions for Class 9 Science Chapter 4 (Hindi Medium) 7\" width=\"222\" height=\"159\" data-recalc-dims=\"1\" \/><\/p>\n<p><strong>\u092a\u094d\u0930\u0966 4. \u092c\u094b\u0930 \u0915\u0947 \u092a\u0930\u092e\u093e\u0923\u0941 \u092e\u0949\u0921\u0932 \u0915\u0940 \u0935\u094d\u092f\u093e\u0916\u094d\u092f\u093e \u0915\u0940\u091c\u093f\u090f\u0964<\/strong><br \/>\n<strong>\u0909\u0924\u094d\u0924\u0930-<\/strong> \u0928\u0940\u0932\u094d\u0938 \u092c\u094b\u0930 \u0928\u0947 \u092a\u0930\u092e\u093e\u0923\u0941 \u0915\u0940 \u0938\u0902\u0930\u091a\u0928\u093e \u0915\u0947 \u092c\u093e\u0930\u0947 \u092e\u0947\u0902 \u0928\u093f\u092e\u094d\u0928\u0932\u093f\u0916\u093f\u0924 \u0905\u0935\u0927\u093e\u0930\u0923\u093e\u090f\u0901 \u092a\u094d\u0930\u0938\u094d\u0924\u0941\u0924 \u0915\u0940\u0902|<br \/>\n(i) \u092a\u0930\u092e\u093e\u0923\u0941 \u0915\u0947 \u0915\u0947\u0902\u0926\u094d\u0930 \u092e\u0947\u0902 \u090f\u0915 \u0927\u0928\u093e\u0935\u0947\u0936\u093f\u0924 \u0928\u093e\u092d\u093f\u0915 \u0939\u094b\u0924\u093e \u0939\u0948\u0964 \u092a\u094d\u0930\u094b\u091f\u0949\u0928 \u0914\u0930 \u0928\u094d\u092f\u0942\u091f\u094d\u0930\u0949\u0928 \u0928\u093e\u092d\u093f\u0915 \u092e\u0947\u0902 \u0939\u094b\u0924\u0947 \u0939\u0948\u0902\u0964<br \/>\n(ii) \u0907\u0932\u0947\u0915\u094d\u091f\u094d\u0930\u0949\u0928 \u0915\u0947\u0935\u0932 \u0915\u0941\u091b \u0928\u093f\u0936\u094d\u091a\u093f\u0924 \u0915\u0915\u094d\u0937\u093e\u0913\u0902 \u092e\u0947\u0902 \u0939\u0940 \u091a\u0915\u094d\u0915\u0930 \u0932\u0917\u093e \u0938\u0915\u0924\u0947 \u0939\u0948\u0902, \u091c\u093f\u0928\u094d\u0939\u0947\u0902 \u0907\u0932\u0947\u0915\u094d\u091f\u094d\u0930\u0949\u0928 \u0915\u0940 \u0935\u093f\u0935\u093f\u0915\u094d\u0924 \u0915\u0915\u094d\u0937\u093e (Discrete Orbits) \u0915\u0939\u0924\u0947 \u0939\u0948\u0902\u0964<br \/>\n(iii) \u091c\u092c \u0907\u0932\u0947\u0915\u094d\u091f\u094d\u0930\u0949\u0928 \u0907\u0938 \u0935\u093f\u0935\u093f\u0915\u094d\u0924 \u0915\u0915\u094d\u0937\u093e \u092e\u0947\u0902 \u091a\u0915\u094d\u0915\u0930 \u0932\u0917\u093e\u0924\u0947 \u0939\u0948\u0902, \u0924\u094b \u0909\u0928\u0915\u0940 \u090a\u0930\u094d\u091c\u093e \u0915\u093e \u0935\u093f\u0915\u093f\u0930\u0923 \u0928\u0939\u0940\u0902 \u0939\u094b\u0924\u093e\u0964<\/p>\n<p>\u0907\u0928 \u0915\u0915\u094d\u0937\u093e\u0913\u0902 (\u092f\u093e \u0915\u094b\u0936\u094b\u0902) \u0915\u094b \u090a\u0930\u094d\u091c\u093e-\u0938\u094d\u0924\u0930 \u0915\u0939\u0924\u0947 \u0939\u0948\u0902, \u091c\u093f\u0928\u094d\u0939\u0947\u0902 K, L, M, N&#8230;&#8230;.. \u092f\u093e \u0938\u0902\u0916\u094d\u092f\u093e\u0913\u0902 1, 2, 3, 4, &#8230;&#8230;. \u0915\u0947 \u0926\u094d\u0935\u093e\u0930\u093e \u0926\u093f\u0916\u093e\u092f\u093e \u091c\u093e\u0924\u093e \u0939\u0948\u0964<br \/>\n<img loading=\"lazy\" src=\"https:\/\/i2.wp.com\/farm1.staticflickr.com\/861\/43832747792_b69275e79e_o.png?resize=291%2C199&#038;ssl=1\" alt=\"NCERT Solutions for Class 9 Science Chapter 4 (Hindi Medium) 8\" width=\"291\" height=\"199\" data-recalc-dims=\"1\" \/><\/p>\n<p><strong>\u092a\u094d\u0930\u0966 5. \u0907\u0938 \u0905\u0927\u094d\u092f\u093e\u092f \u092e\u0947\u0902 \u0926\u093f\u090f \u0917\u090f \u0938\u092d\u0940 \u092a\u0930\u092e\u093e\u0923\u0941 \u092e\u0949\u0921\u0932\u094b\u0902 \u0915\u0940 \u0924\u0941\u0932\u0928\u093e \u0915\u0940\u091c\u093f\u090f\u0964<\/strong><br \/>\n<strong>\u0909\u0924\u094d\u0924\u0930-<\/strong><br \/>\n<img loading=\"lazy\" src=\"https:\/\/i2.wp.com\/farm2.staticflickr.com\/1773\/43832749182_215850ee26_o.png?resize=558%2C796&#038;ssl=1\" alt=\"NCERT Solutions for Class 9 Science Chapter 4 (Hindi Medium) 9\" width=\"558\" height=\"796\" data-recalc-dims=\"1\" \/><\/p>\n<p><strong>\u092a\u094d\u0930\u0966 6. \u092a\u0939\u0932\u0947 \u0905\u0920\u093e\u0930\u0939 \u0924\u0924\u094d\u0924\u094d\u0935\u094b\u0902 \u0915\u0947 \u0935\u093f\u092d\u093f\u0928\u094d\u0928 \u0915\u0915\u094d\u0937\u094b\u0902 \u092e\u0947\u0902 \u0907\u0932\u0947\u0915\u094d\u091f\u094d\u0930\u0949\u0928 \u0935\u093f\u0924\u0930\u0923 \u0915\u0947 \u0928\u093f\u092f\u092e \u0915\u094b \u0932\u093f\u0916\u093f\u090f\u0964<\/strong><br \/>\n<strong>\u0909\u0924\u094d\u0924\u0930-<\/strong> \u092a\u0930\u092e\u093e\u0923\u0941\u0913\u0902 \u0915\u0940 \u0935\u093f\u092d\u093f\u0928\u094d\u0928 \u0915\u0915\u094d\u0937\u093e\u0913\u0902 \u092e\u0947\u0902 \u0907\u0932\u0947\u0915\u094d\u091f\u094d\u0930\u0949\u0928\u094b\u0902 \u0915\u0947 \u0935\u093f\u0924\u0930\u0923 \u0915\u0947 \u0932\u093f\u090f \u092c\u094b\u0930 \u0914\u0930 \u092c\u0930\u0940 \u0928\u0947 \u0928\u093f\u092e\u094d\u0928\u0932\u093f\u0916\u093f\u0924 \u0928\u093f\u092f\u092e \u092a\u094d\u0930\u0938\u094d\u0924\u0941\u0924 \u0915\u093f\u090f\u0964<br \/>\n(i) \u0915\u093f\u0938\u0940 \u0915\u0915\u094d\u0937\u093e \u092e\u0947\u0902 \u0909\u092a\u0938\u094d\u0925\u093f\u0924 \u0905\u0927\u093f\u0915\u0924\u092e \u0907\u0932\u0947\u0915\u094d\u091f\u094d\u0930\u0949\u0928\u094b\u0902 \u0915\u0940 \u0938\u0902\u0916\u094d\u092f\u093e 2n2 \u0938\u0947 \u0926\u0930\u094d\u0936\u093e\u092f\u093e \u091c\u093e\u0924\u093e \u0939\u0948; \u091c\u0939\u093e\u0901 &#8216;n&#8217; \u0915\u0915\u094d\u0937\u093e \u0915\u0940 \u0938\u0902\u0916\u094d\u092f\u093e \u092f\u093e<br \/>\n\u090a\u0930\u094d\u091c\u093e \u0938\u094d\u0924\u0930 \u0939\u0948\u0964<br \/>\n<img loading=\"lazy\" src=\"https:\/\/i0.wp.com\/farm2.staticflickr.com\/1772\/43832749592_f86ce3058b_o.png?resize=358%2C193&#038;ssl=1\" alt=\"NCERT Solutions for Class 9 Science Chapter 4 (Hindi Medium) 10\" width=\"358\" height=\"193\" data-recalc-dims=\"1\" \/><\/p>\n<p>(ii) \u0938\u092c\u0938\u0947 \u092c\u093e\u0939\u0930\u0940 \u0915\u094b\u0936 \u092e\u0947\u0902 \u0907\u0932\u0947\u0915\u094d\u091f\u094d\u0930\u0949\u0928\u094b\u0902 \u0915\u0940 \u0905\u0927\u093f\u0915\u0924\u092e \u0938\u0902\u0916\u094d\u092f\u093e 8 \u0939\u094b \u0938\u0915\u0924\u0940 \u0939\u0948\u0964<\/p>\n<p>(iii) \u0915\u093f\u0938\u0940 \u092a\u0930\u092e\u093e\u0923\u0941 \u0915\u0947 \u0926\u093f\u090f \u0917\u090f \u0915\u094b\u0936 \u092e\u0947\u0902 \u0907\u0932\u0947\u0915\u094d\u091f\u094d\u0930\u0949\u0928 \u0924\u092c \u0924\u0915 \u0938\u094d\u0925\u093e\u0928 \u0928\u0939\u0940\u0902 \u0932\u0947\u0924\u0947 \u0939\u0948\u0902 \u091c\u092c \u0924\u0915 \u0915\u093f \u0909\u0938\u0938\u0947 \u092a\u0939\u0932\u0947 \u0935\u093e\u0932\u0947 \u092d\u0940\u0924\u0930\u0940 \u0915\u0915\u094d\u0937 \u092a\u0942\u0930\u094d\u0923\u0930\u0942\u092a \u0938\u0947 \u092d\u0930 \u0928\u0939\u0940\u0902 \u091c\u093e\u0924\u0947\u0964 \u0907\u0938\u0938\u0947 \u0938\u094d\u092a\u0937\u094d\u091f \u0939\u094b\u0924\u093e \u0939\u0948 \u0915\u093f \u0915\u0915\u094d\u0937\u093e\u090f\u0901 \u0915\u094d\u0930\u092e\u093e\u0928\u0941\u0938\u093e\u0930 \u092d\u0930\u0924\u0940 \u0939\u0948\u0902\u0964<\/p>\n<p><strong>\u092a\u094d\u0930\u0966 7. \u0938\u093f\u0932\u093f\u0915\u0949\u0928 \u0914\u0930 \u0911\u0915\u094d\u0938\u0940\u091c\u0928 \u0915\u093e \u0909\u0926\u093e\u0939\u0930\u0923 \u0932\u0947\u0924\u0947 \u0939\u0941\u090f \u0938\u0902\u092f\u094b\u091c\u0915\u0924\u093e \u0915\u0940 \u092a\u0930\u093f\u092d\u093e\u0937\u093e \u0926\u0940\u091c\u093f\u090f\u0964<\/strong><br \/>\n<strong>\u0909\u0924\u094d\u0924\u0930-<\/strong> \u092a\u094d\u0930\u0924\u094d\u092f\u0947\u0915 \u0924\u0924\u094d\u0924\u094d\u0935 \u0915\u0947 \u092a\u0930\u092e\u093e\u0923\u0941 \u0915\u0940 \u090f\u0915 \u0928\u093f\u0936\u094d\u091a\u093f\u0924 \u0938\u0902\u092f\u094b\u091c\u0928-\u0936\u0915\u094d\u0924\u093f \u0939\u094b\u0924\u0940 \u0939\u0948, \u091c\u093f\u0938\u0947 \u0938\u0902\u092f\u094b\u091c\u0915\u0924\u093e \u0915\u0939\u0924\u0947 \u0939\u0948\u0902\u0964 \u0915\u093f\u0938\u0940 \u092a\u0930\u092e\u093e\u0923\u0941 \u0915\u0947 \u092c\u093e\u0939\u094d\u092f\u0924\u092e \u0915\u0915\u094d\u0937 \u092e\u0947\u0902 \u0905\u0937\u094d\u091f\u0915 \u092a\u0942\u0930\u094d\u0923 \u0915\u0930\u0928\u0947 \u0915\u0947 \u0932\u093f\u090f \u091c\u093f\u0924\u0928\u0940 \u0938\u0902\u0916\u094d\u092f\u093e \u092e\u0947\u0902 \u0907\u0932\u0947\u0915\u094d\u091f\u094d\u0930\u0949\u0928\u094b\u0902 \u0915\u0940 \u0938\u093e\u091d\u0947\u0926\u093e\u0930\u0940 \u092f\u093e \u0938\u094d\u0925\u093e\u0928\u093e\u0902\u0924\u0930\u0923 \u0915\u093f\u092f\u093e \u091c\u093e\u0924\u093e \u0939\u0948, \u0935\u0939\u0940 \u0909\u0938 \u0924\u0924\u094d\u0924\u094d\u0935 \u0915\u0940 \u0938\u0902\u092f\u094b\u091c\u0928-\u0936\u0915\u094d\u0924\u093f \u092f\u093e \u0938\u0902\u092f\u094b\u091c\u0915\u0924\u093e \u0939\u094b\u0924\u0940 \u0939\u0948\u0964 \u0911\u0915\u094d\u0938\u0940\u091c\u0928 \u0915\u093e \u092a\u0930\u092e\u093e\u0923\u0941 \u0926\u094d\u0930\u0935\u094d\u092f\u092e\u093e\u0928 = 8 \u0938\u093f\u0932\u093f\u0915\u0949\u0928 \u0915\u093e \u092a\u0930\u092e\u093e\u0923\u0941 \u0926\u094d\u0930\u0935\u094d\u092f\u092e\u093e\u0928 = 14<br \/>\n<img loading=\"lazy\" src=\"https:\/\/i2.wp.com\/farm1.staticflickr.com\/859\/43832749812_c18e31225e_o.png?resize=203%2C172&#038;ssl=1\" alt=\"NCERT Solutions for Class 9 Science Chapter 4 (Hindi Medium) 11\" width=\"203\" height=\"172\" data-recalc-dims=\"1\" \/><br \/>\n\u0911\u0915\u094d\u0938\u0940\u091c\u0928 (O) \u092e\u0947\u0902 6 \u0938\u0902\u092f\u094b\u091c\u0940 \u0907\u0932\u0947\u0915\u094d\u091f\u094d\u0930\u0949\u0928 \u0939\u0948\u0902\u0964 \u0907\u0938\u0932\u093f\u090f \u092f\u0939 2 \u0907\u0932\u0947\u0915\u094d\u091f\u094d\u0930\u0949\u0928 \u0917\u094d\u0930\u0939\u0923 \u0915\u0930\u0915\u0947 \u0905\u0937\u094d\u091f\u0915 \u092a\u0942\u0930\u094d\u0923 \u0915\u0930\u0947\u0917\u093e\u0964 \u091a\u0942\u0901\u0915\u093f \u0911\u0915\u094d\u0938\u0940\u091c\u0928 \u0915\u0940 \u0938\u0902\u092f\u094b\u091c\u0928-\u0936\u0915\u094d\u0924\u093f (Combining Capacity) = 2\u0964 \u0907\u0938\u0932\u093f\u090f \u0911\u0915\u094d\u0938\u0940\u091c\u0928 \u0915\u0940 \u0938\u0902\u092f\u094b\u091c\u0915\u0924\u093e = 2 \u0939\u0948\u0964 4 \u0938\u0947 \u0905\u0927\u093f\u0915 \u0938\u0902\u092f\u094b\u091c\u0940 \u0907\u0932\u0947\u0915\u094d\u091f\u094d\u0930\u0949\u0928 \u0939\u094b\u0928\u0947 \u092a\u0930 \u0928\u093f\u092e\u094d\u0928 \u0938\u0942\u0924\u094d\u0930 \u0926\u094d\u0935\u093e\u0930\u093e \u0938\u0902\u092f\u094b\u091c\u0915\u0924\u093e \u091c\u094d\u091e\u093e\u0924 \u0915\u0940 \u091c\u093e \u0938\u0915\u0924\u0940 \u0939\u0948\u0964<br \/>\n\u0938\u0902\u092f\u094b\u091c\u0915\u0924\u093e = 8 &#8211; \u0938\u0902\u092f\u094b\u091c\u0940 \u0907\u0932\u0947\u0915\u094d\u091f\u094d\u0930\u0949\u0928\u094b\u0902 \u0915\u0940 \u0938\u0902\u0916\u094d\u092f\u093e (\u092c\u093e\u0939\u094d\u092f\u0924\u092e \u0915\u094b\u0936 \u092e\u0947\u0902 \u0907\u0932\u0947\u0915\u094d\u091f\u094d\u0930\u0949\u0928\u094b\u0902 \u0915\u0940 \u0938\u0902\u0916\u094d\u092f\u093e)<br \/>\n\u0911\u0915\u094d\u0938\u0940\u091c\u0928 \u0915\u0940 \u0938\u0902\u092f\u094b\u091c\u0915\u0924\u093e = 8 &#8211; 6 = 2<br \/>\n\u091a\u0942\u0901\u0915\u093f \u0938\u093f\u0932\u093f\u0915\u0949\u0928 \u0915\u0947 \u092c\u093e\u0939\u094d\u092f\u0924\u092e \u0915\u094b\u0936 \u092e\u0947\u0902 4 \u0907\u0932\u0947\u0915\u094d\u091f\u094d\u0930\u0949\u0928 \u0939\u0948\u0902\u0964<br \/>\n\u0907\u0938\u0932\u093f\u090f \u092f\u0939 \u091a\u0930 \u0907\u0932\u0947\u0915\u094d\u091f\u094d\u0930\u0949\u0928 \u0938\u093e\u091d\u093e \u0915\u0930\u0915\u0947 \u0905\u092a\u0928\u093e \u0905\u0937\u094d\u091f\u0915 \u092a\u0942\u0930\u094d\u0923 \u0915\u0930\u0947\u0917\u093e\u0964<br \/>\n\u091a\u0942\u0901\u0915\u093f, \u0938\u093f\u0932\u093f\u0915\u0949\u0928 \u0915\u0940 \u0938\u0902\u092f\u094b\u091c\u0928-\u0936\u0915\u094d\u0924\u093f = 4 \u0939\u0948\u0964<\/p>\n<p><strong>\u092a\u094d\u0930\u0966 8. \u0909\u0926\u093e\u0939\u0930\u0923 \u0915\u0947 \u0938\u093e\u0925 \u0935\u094d\u092f\u093e\u0916\u094d\u092f\u093e \u0915\u0940\u091c\u093f\u090f-\u092a\u0930\u092e\u093e\u0923\u0941 \u0938\u0902\u0916\u094d\u092f\u093e, \u0926\u094d\u0930\u0935\u094d\u092f\u092e\u093e\u0928 \u0938\u0902\u0916\u094d\u092f\u093e, \u0938\u092e\u0938\u094d\u0925\u093e\u0928\u093f\u0915 \u0914\u0930 \u0938\u092e\u092d\u093e\u0930\u093f\u0915\u0964 \u0938\u092e\u0938\u094d\u0925\u093e\u0928\u093f\u0915\u094b\u0902 \u0915\u0947 \u0915\u094b\u0908 \u0926\u094b \u0909\u092a\u092f\u094b\u0917 \u0932\u093f\u0916\u093f\u090f\u0964<\/strong><br \/>\n<strong>\u0909\u0924\u094d\u0924\u0930-<\/strong> <strong>\u092a\u0930\u092e\u093e\u0923\u0941 \u0938\u0902\u0916\u094d\u092f\u093e (Atomic Number) &#8211;<\/strong> \u090f\u0915 \u0924\u0924\u094d\u0924\u094d\u0935 \u0915\u0940 \u092a\u0930\u092e\u093e\u0923\u0941 \u0938\u0902\u0916\u094d\u092f\u093e \u0928\u093e\u092d\u093f\u0915 (\u0915\u0947\u0902\u0926\u094d\u0930\u0915) \u092e\u0947\u0902 \u0935\u093f\u0926\u094d\u092f\u092e\u093e\u0928 \u092a\u094d\u0930\u094b\u091f\u0949\u0928\u094b\u0902 \u0915\u0940 \u0915\u0941\u0932 \u0938\u0902\u0916\u094d\u092f\u093e \u0915\u0947 \u092c\u0930\u093e\u092c\u0930 \u0939\u094b\u0924\u0940 \u0939\u0948\u0964 \u0907\u0938\u0947 Z \u0915\u0947 \u0926\u094d\u0935\u093e\u0930\u093e \u0926\u0930\u094d\u0936\u093e\u092f\u093e \u091c\u093e\u0924\u093e \u0939\u0948\u0964 \u0939\u093e\u0907\u0921\u094d\u0930\u094b\u091c\u0928 \u0915\u0947 \u0932\u093f\u090f Z = 1 \u0915\u094d\u092f\u094b\u0902\u0915\u093f \u0939\u093e\u0907\u0921\u094d\u0930\u094b\u091c\u0928 \u092a\u0930\u092e\u093e\u0923\u0941 \u0915\u0947 \u0928\u093e\u092d\u093f\u0915 \u092e\u0947\u0902 \u0915\u0947\u0935\u0932 \u090f\u0915 \u092a\u094d\u0930\u094b\u091f\u0949\u0928 \u0939\u094b\u0924\u093e \u0939\u0948\u0964 \u0907\u0938\u0940 \u092a\u094d\u0930\u0915\u093e\u0930, \u0938\u094b\u0921\u093f\u092f\u092e \u0915\u0940 \u092a\u0930\u092e\u093e\u0923\u0941 \u0938\u0902\u0916\u094d\u092f\u093e Z = 11 \u0939\u0948\u0964<\/p>\n<p><strong>\u0926\u094d\u0930\u0935\u094d\u092f\u092e\u093e\u0928 \u0938\u0902\u0916\u094d\u092f\u093e (Mass Number) &#8211;<\/strong> \u090f\u0915 \u092a\u0930\u092e\u093e\u0923\u0941 \u0915\u0947 \u0928\u093e\u092d\u093f\u0915 \u092e\u0947\u0902 \u0909\u092a\u0938\u094d\u0925\u093f\u0924 \u092a\u094d\u0930\u094b\u091f\u0949\u0928\u094b\u0902 \u0914\u0930 \u0928\u094d\u092f\u0942\u091f\u094d\u0930\u0949\u0928\u094b\u0902 \u0915\u0940 \u0915\u0941\u0932 \u0938\u0902\u0916\u094d\u092f\u093e \u0915\u0947 \u092f\u094b\u0917 \u0915\u094b \u0926\u094d\u0930\u0935\u094d\u092f\u092e\u093e\u0928 \u0938\u0902\u0916\u094d\u092f\u093e \u0915\u0939\u093e \u091c\u093e\u0924\u093e \u0939\u0948\u0964 \u0909\u0926\u093e\u0939\u0930\u0923 \u0915\u0947 \u0932\u093f\u090f, \u0915\u093e\u0930\u094d\u092c\u0928 \u0915\u093e \u0926\u094d\u0930\u0935\u094d\u092f\u092e\u093e\u0928 \u0938\u0902\u0916\u094d\u092f\u093e 12u \u0939\u0948\u0964 \u0915\u094d\u092f\u094b\u0902\u0915\u093f \u0907\u0938\u092e\u0947\u0902 6 \u092a\u094d\u0930\u094b\u091f\u0949\u0928 \u0914\u0930 6 \u0928\u094d\u092f\u0942\u091f\u094d\u0930\u0949\u0928 \u0939\u094b\u0924\u0947 \u0939\u0948\u0902, 6u + 6u = 12u.<br \/>\n\u0907\u0938\u0940 \u092a\u094d\u0930\u0915\u093e\u0930, \u092b\u0949\u0938\u094d\u092b\u094b\u0930\u0938 \u0915\u0940 \u0926\u094d\u0930\u0935\u094d\u092f\u092e\u093e\u0928 \u0938\u0902\u0916\u094d\u092f\u093e = 31u \u0939\u0948\u0964<br \/>\n\u0915\u094d\u092f\u094b\u0902\u0915\u093f<br \/>\n\u092a\u094d\u0930\u094b\u091f\u0949\u0928\u094b\u0902 \u0915\u0940 \u0938\u0902\u0916\u094d\u092f\u093e = 15,<br \/>\n\u0928\u094d\u092f\u0942\u091f\u094d\u0930\u0949\u0928\u094b\u0902 \u0915\u0940 \u0938\u0902\u0916\u094d\u092f\u093e = 16<br \/>\n\u0926\u094d\u0930\u0935\u094d\u092f\u092e\u093e\u0928 \u0938\u0902\u0916\u094d\u092f\u093e = 15 + 16 = 31<\/p>\n<p><strong>\u0938\u092e\u0938\u094d\u0925\u093e\u0928\u093f\u0915 (Isotopes) &#8211;<\/strong> \u090f\u0915 \u0939\u0940 \u0924\u0924\u094d\u0924\u094d\u0935 \u0915\u0947 \u092a\u0930\u092e\u093e\u0923\u0941 \u091c\u093f\u0928\u0915\u0940 \u092a\u0930\u092e\u093e\u0923\u0941 \u0938\u0902\u0916\u094d\u092f\u093e \u0938\u092e\u093e\u0928 \u0932\u0947\u0915\u093f\u0928 \u0926\u094d\u0930\u0935\u094d\u092f\u092e\u093e\u0928 \u0938\u0902\u0916\u094d\u092f\u093e \u092d\u093f\u0928\u094d\u0928 \u0939\u094b\u0924\u0940 \u0939\u0948\u0902, \u0938\u092e\u0938\u094d\u0925\u093e\u0928\u093f\u0915 \u0915\u0939\u0932\u093e\u0924\u0947 \u0939\u0948\u0902\u0964<br \/>\n\u091c\u0948\u0938\u0947-\u0939\u093e\u0907\u0921\u094d\u0930\u094b\u091c\u0928 \u0915\u0947 \u0924\u0940\u0928 \u0938\u092e\u0938\u094d\u0925\u093e\u0928\u093f\u0915 \u0939\u0948\u0902- \u092a\u094d\u0930\u094b\u091f\u093f\u092f\u092e \\(_{ 1 }^{ 1 }{ H }\\), \u0921\u094d\u092f\u0942\u091f\u0940\u0930\u093f\u092f\u092e (\\(_{ 2 }^{ 1 }{ H }\\) \u092f\u093e D), \u091f\u094d\u0930\u093e\u0907\u091f\u093f\u092f\u092e (\\(_{ 3 }^{ 1 }{ H }\\) \u092f\u093e T), \u092a\u094d\u0930\u0924\u094d\u092f\u0947\u0915 \u0915\u0940 \u092a\u0930\u092e\u093e\u0923\u0941 \u0938\u0902\u0916\u094d\u092f\u093e 1 \u0939\u0948 \u092a\u0930\u0902\u0924\u0941 \u0926\u094d\u0930\u0935\u094d\u092f\u092e\u093e\u0928 \u0938\u0902\u0916\u094d\u092f\u093e \u0915\u094d\u0930\u092e\u0936\u0903 1, 2, 3 \u0939\u0948\u0964 \u0907\u0938\u0940 \u092a\u094d\u0930\u0915\u093e\u0930 \u0915\u093e\u0930\u094d\u092c\u0928 \u0915\u0947 \u0926\u094b \u0938\u092e\u0938\u094d\u0925\u093e\u0928\u093f\u0915 \u0939\u0948\u0902- \\(_{ 12 }^{ 6 }{ C }\\) \u0914\u0930 \\(_{ 14 }^{ 6 }{ C }\\)<\/p>\n<p><strong>\u0938\u092e\u092d\u093e\u0930\u093f\u0915 (Isobars) &#8211;<\/strong> \u0938\u092e\u092d\u093e\u0930\u093f\u0915 \u0935\u093f\u092d\u093f\u0928\u094d\u0928 \u0924\u0924\u094d\u0924\u094d\u0935\u094b\u0902 \u0915\u0947 \u0935\u0947 \u092a\u0930\u092e\u093e\u0923\u0941 \u0939\u0948\u0902, \u091c\u093f\u0928\u0915\u0940 \u0926\u094d\u0930\u0935\u094d\u092f\u092e\u093e\u0928 \u0938\u0902\u0916\u094d\u092f\u093e \u0938\u092e\u093e\u0928 \u0932\u0947\u0915\u093f\u0928 \u092a\u0930\u092e\u093e\u0923\u0941 \u0938\u0902\u0916\u094d\u092f\u093e \u092d\u093f\u0928\u094d\u0928-\u092d\u093f\u0928\u094d\u0928 \u0939\u094b\u0924\u0940 \u0939\u0948\u0964 \u0909\u0926\u093e\u0939\u0930\u0923 \u0915\u0947 \u0932\u093f\u090f, \u0915\u0948\u0932\u094d\u0938\u093f\u092f\u092e Ca \u0914\u0930 \u0906\u0930\u094d\u0917\u0928 \u0915\u0940 \u092a\u0930\u092e\u093e\u0923\u0941 \u0938\u0902\u0916\u094d\u092f\u093e \u0915\u094d\u0930\u092e\u0936\u0903 20 \u0914\u0930 18 \u0939\u0948 \u092a\u0930\u0902\u0924\u0941 \u0926\u094b\u0928\u094b\u0902 \u0924\u0924\u094d\u0924\u094d\u0935\u094b\u0902 \u0915\u0940 \u0926\u094d\u0930\u0935\u094d\u092f\u092e\u093e\u0928 \u0938\u0902\u0916\u094d\u092f\u093e 40 \u0939\u0948\u0964 \u0907\u0938\u0932\u093f\u090f, 18ca \u0914\u0930 18 Ar \u0938\u092e\u092d\u093e\u0930\u093f\u0915 \u0939\u0948\u0902\u0964<\/p>\n<p>\u0938\u092e\u0938\u094d\u0925\u093e\u0928\u093f\u0915\u094b\u0902 \u0915\u0947 \u0926\u094b \u0909\u092a\u092f\u094b\u0917 \u0928\u093f\u092e\u094d\u0928\u0932\u093f\u0916\u093f\u0924 \u0939\u0948\u0902|<br \/>\n(i) \u0915\u0948\u0902\u0938\u0930 \u0915\u0947 \u0909\u092a\u091a\u093e\u0930 \u092e\u0947\u0902 \u0915\u094b\u092c\u093e\u0932\u094d\u091f \u0915\u0947 \u0938\u092e\u0938\u094d\u0925\u093e\u0928\u093f\u0915 \u0915\u093e \u0909\u092a\u092f\u094b\u0917 \u0939\u094b\u0924\u093e \u0939\u0948\u0964<br \/>\n(ii) \u092f\u0942\u0930\u0947\u0928\u093f\u092f\u092e \u0915\u0947 \u090f\u0915 \u0938\u092e\u0938\u094d\u0925\u093e\u0928\u093f\u0915 \u0915\u093e \u0909\u092a\u092f\u094b\u0917 \u092a\u0930\u092e\u093e\u0923\u0941 \u092d\u091f\u094d\u091f\u0940 (Atomic Reactor) \u092e\u0947\u0902 \u0908\u0902\u0927\u0928 \u0915\u0947 \u0930\u0942\u092a \u092e\u0947\u0902 \u0939\u094b\u0924\u093e \u0939\u0948\u0964<\/p>\n<p><strong>\u092a\u094d\u0930\u0966 9. Na+ \u0915\u0947 \u092a\u0942\u0930\u0940 \u0924\u0930\u0939 \u0938\u0947 \u092d\u0930\u0947 \u0939\u0941\u090f K \u0935 L \u0915\u094b\u0936 \u0939\u094b\u0924\u0947 \u0939\u0948\u0902-\u0935\u094d\u092f\u093e\u0916\u094d\u092f\u093e \u0915\u0940\u091c\u093f\u090f\u0964<\/strong><br \/>\n<strong>\u0909\u0924\u094d\u0924\u0930-<\/strong> \u0938\u094b\u0921\u093f\u092f\u092e Na \u0915\u0940 \u092a\u0930\u092e\u093e\u0923\u0941 \u0938\u0902\u0916\u094d\u092f\u093e = 11 \u0907\u0932\u0947\u0915\u094d\u091f\u094d\u0930\u0949\u0928\u093f\u0915 \u0935\u093f\u0928\u094d\u092f\u093e\u0938\u0903<br \/>\nK L M<br \/>\n2 8 1<br \/>\n\u091a\u0942\u0901\u0915\u093f \u0938\u094b\u0921\u093f\u092f\u092e \u0915\u0947 \u092c\u093e\u0939\u094d\u092f\u0924\u092e \u0915\u0915\u094d\u0937 (\u0915\u094b\u0936) \u092e\u0947\u0902 1 \u0907\u0932\u0947\u0915\u094d\u091f\u094d\u0930\u0949\u0928 \u0939\u0948 \u0907\u0938\u0932\u093f\u090f \u092f\u0939 \u090f\u0915 \u0907\u0932\u0947\u0915\u094d\u091f\u094d\u0930\u0949\u0928 \u0915\u093e \u0924\u094d\u092f\u093e\u0917 \u0915\u0930\u0915\u0947 (Na&#8217;) \u0906\u092f\u0928 \u092c\u0928\u093e\u0924\u093e \u0939\u0948 \u0914\u0930 \u0905\u092a\u0928\u093e \u0905\u0937\u094d\u091f\u0915 \u092a\u0942\u0930\u094d\u0923 \u0915\u0930\u0924\u093e \u0939\u0948\u0964<br \/>\nNa+ \u092e\u0947\u0902 10 \u0907\u0932\u0947\u0915\u094d\u091f\u094d\u0930\u0949\u0928 \u0939\u094b\u0924\u0947 \u0939\u0948\u0902 \u092f\u093e\u0928\u0940 K \u0915\u094b\u0936 \u092e\u0947\u0902 2 \u0924\u0925\u093e L \u0915\u094b\u0936 \u092e\u0947\u0902 8 \u0939\u092e \u091c\u093e\u0928\u0924\u0947 \u0939\u0948\u0902 \u0915\u093f K \u0915\u094b\u0936 \u092e\u0947\u0902 \u0905\u0927\u093f\u0915\u0924\u092e = 2 x 1\u00b2 = 2 \u0924\u0925\u093e L \u0915\u094b\u0936 \u092e\u0947\u0902 \u0905\u0927\u093f\u0915\u0924\u092e = 2 x 2\u00b2 = 8 \u0907\u0932\u0947\u0915\u094d\u091f\u094d\u0930\u0949\u0928 \u0930\u0939 \u0938\u0915\u0924\u0947 \u0939\u0948\u0902\u0964<br \/>\n\u0905\u0924: Na+ \u092e\u0947\u0902 K \u0914\u0930 L \u0915\u094b\u0936 \u092a\u0942\u0930\u094d\u0923\u0924\u0903 \u092d\u0930\u0947 \u0939\u0941\u090f \u0939\u0948\u0902\u0964<\/p>\n<p><strong>\u092a\u094d\u0930\u0966 10. \u0905\u0917\u0930 \u092c\u094d\u0930\u094b\u092e\u0940\u0928 \u092a\u0930\u092e\u093e\u0923\u0941 \u0926\u094b \u0938\u092e\u0938\u094d\u0925\u093e\u0928\u093f\u0915\u094b\u0902 [\\(_{ 79 }^{ 35 }{ Br }\\) (49.7%) \u0924\u0925\u093e [\\(_{ 81 }^{ 35 }{ Br }\\) (50.3%)] \u0915\u0947 \u0930\u0942\u092a \u092e\u0947\u0902 \u0939\u0948, \u0924\u094b \u092c\u094d\u0930\u094b\u092e\u0940\u0928 \u092a\u0930\u092e\u093e\u0923\u0941 \u0915\u0947 \u0914\u0938\u0924 \u092a\u0930\u092e\u093e\u0923\u0941 \u0926\u094d\u0930\u0935\u094d\u092f\u092e\u093e\u0928 \u0915\u0940 \u0917\u0923\u0928\u093e \u0915\u0940\u091c\u093f\u090f\u0964<\/strong><br \/>\n<strong>\u0909\u0924\u094d\u0924\u0930-<\/strong><br \/>\n<a title=\"NCERT Solutions for Class 9 Science Chapter 4 (Hindi Medium) 12\" href=\"https:\/\/www.flickr.com\/photos\/157064082@N07\/43832749982\/in\/dateposted-public\/\" data-flickr-embed=\"true\"><img loading=\"lazy\" src=\"https:\/\/i1.wp.com\/farm1.staticflickr.com\/931\/43832749982_56f4fc243d_o.png?resize=317%2C132&#038;ssl=1\" alt=\"NCERT Solutions for Class 9 Science Chapter 4 (Hindi Medium) 12\" width=\"317\" height=\"132\" data-recalc-dims=\"1\" \/><\/a><\/p>\n<p><strong>\u092a\u094d\u0930\u0966 11. \u090f\u0915 \u0924\u0924\u094d\u0924\u094d\u0935 X \u0915\u093e \u092a\u0930\u092e\u093e\u0923\u0941 \u0926\u094d\u0930\u0935\u094d\u092f\u092e\u093e\u0928 16.2u \u0939\u0948 \u0924\u094b \u0907\u0938\u0915\u0947 \u0915\u093f\u0938\u0940 \u090f\u0915 \u0928\u092e\u0942\u0928\u0947 \u092e\u0947\u0902 \u0938\u092e\u0938\u094d\u0925\u093e\u0928\u093f\u0915 [\\(_{ 16 }^{ 8 }{ X }\\) \u0914\u0930 [\\(_{ 18 }^{ 8 }{ X }\\) \u0915\u093e \u092a\u094d\u0930\u0924\u093f\u0936\u0924 \u0915\u094d\u092f\u093e \u0939\u094b\u0917\u093e?<\/strong><br \/>\n<strong>\u0909\u0924\u094d\u0924\u0930-<\/strong><br \/>\n<img loading=\"lazy\" src=\"https:\/\/i2.wp.com\/farm1.staticflickr.com\/855\/28944567637_50535b17e8_o.png?resize=319%2C121&#038;ssl=1\" alt=\"NCERT Solutions for Class 9 Science Chapter 4 (Hindi Medium) 13\" width=\"319\" height=\"121\" data-recalc-dims=\"1\" \/><br \/>\n<img loading=\"lazy\" src=\"https:\/\/i2.wp.com\/farm1.staticflickr.com\/941\/28944567777_3bbcc6d09a_o.png?resize=329%2C334&#038;ssl=1\" alt=\"NCERT Solutions for Class 9 Science Chapter 4 (Hindi Medium) 14\" width=\"329\" height=\"334\" data-recalc-dims=\"1\" \/><\/p>\n<p><strong>\u092a\u094d\u0930\u0966 12. \u092f\u0926\u093f \u0924\u0924\u094d\u0924\u094d\u0935 \u0915\u094b Z = 3 \u0939\u094b \u0924\u094b \u0924\u0924\u094d\u0924\u094d\u0935 \u0915\u0940 \u0938\u0902\u092f\u094b\u091c\u0915\u0924\u093e \u0915\u094d\u092f\u093e \u0939\u094b\u0917\u0940? \u0924\u0924\u094d\u0924\u094d\u0935 \u0915\u093e \u0928\u093e\u092e \u092d\u0940 \u0932\u093f\u0916\u093f\u090f\u0964<\/strong><br \/>\n<strong>\u0909\u0924\u094d\u0924\u0930-<\/strong> \u091a\u0942\u0901\u0915\u093f Z = 3 \u0939\u0948\u0964 \u0905\u0930\u094d\u0925\u093e\u0924 \u092a\u0930\u092e\u093e\u0923\u0941 \u0938\u0902\u0916\u094d\u092f\u093e = 3 \u0939\u0948\u0964<br \/>\n<img loading=\"lazy\" src=\"https:\/\/i2.wp.com\/farm2.staticflickr.com\/1837\/43832750562_d5d99157e8_o.png?resize=257%2C67&#038;ssl=1\" alt=\"NCERT Solutions for Class 9 Science Chapter 4 (Hindi Medium) 15\" width=\"257\" height=\"67\" data-recalc-dims=\"1\" \/><br \/>\n\u091a\u0942\u0901\u0915\u093f \u0907\u0938\u0915\u0947 \u092c\u093e\u0939\u094d\u092f\u0924\u092e \u0915\u094b\u0936 \u092e\u0947\u0902 1 \u0907\u0932\u0947\u0915\u094d\u091f\u094d\u0930\u0949\u0928 \u0939\u0948 \u0905\u0924\u0903 \u0924\u0924\u094d\u0924\u094d\u0935 \u0915\u0940 \u0938\u0902\u092f\u094b\u091c\u0915\u0924\u093e = 1 \u0939\u094b\u0917\u0940 \u0915\u094d\u092f\u094b\u0902\u0915\u093f \u092f\u0939 \u0924\u0924\u094d\u0924\u094d\u0935 \u090f\u0915 \u0907\u0932\u0947\u0915\u094d\u091f\u094d\u0930\u0949\u0928 \u0915\u093e \u0924\u094d\u092f\u093e\u0917 \u0915\u0930 \u0938\u0915\u0924\u093e \u0939\u0948\u0964 \u0924\u0925\u093e \u092a\u0930\u092e\u093e\u0923\u0941 \u0938\u0902\u0916\u094d\u092f\u093e 3 \u0935\u093e\u0932\u0947 \u0924\u0924\u094d\u0924\u094d\u0935 \u0915\u093e \u0928\u093e\u092e \u0932\u0940\u0925\u093f\u092f\u092e Li \u0939\u0948\u0964<\/p>\n<p><strong>\u092a\u094d\u0930\u0966 13. \u0926\u094b \u092a\u0930\u092e\u093e\u0923\u0941 \u0938\u094d\u092a\u0940\u0936\u0940\u091c\u093c \u0915\u0947 \u0915\u0947\u0902\u0926\u094d\u0930\u0915\u094b\u0902 \u0915\u093e \u0938\u0902\u0918\u091f\u0928 \u0928\u0940\u091a\u0947 \u0926\u093f\u092f\u093e \u0917\u092f\u093e \u0939\u0948\u0964<\/strong><br \/>\n<img loading=\"lazy\" src=\"https:\/\/i1.wp.com\/farm1.staticflickr.com\/861\/43832750782_fc172cf9ab_o.png?resize=243%2C65&#038;ssl=1\" alt=\"NCERT Solutions for Class 9 Science Chapter 4 (Hindi Medium) 16\" width=\"243\" height=\"65\" data-recalc-dims=\"1\" \/><br \/>\n<strong>X \u0914\u0930 Y \u0915\u0940 \u0926\u094d\u0930\u0935\u094d\u092f\u092e\u093e\u0928 \u0938\u0902\u0916\u094d\u092f\u093e \u091c\u094d\u091e\u093e\u0924 \u0915\u0940\u091c\u093f\u090f\u0964 \u0907\u0928 \u0926\u094b\u0928\u094b\u0902 \u0938\u094d\u092a\u0940\u0936\u0940\u091c\u093c \u092e\u0947\u0902 \u0915\u094d\u092f\u093e \u0938\u0902\u092c\u0902\u0927 \u0939\u0948?<\/strong><br \/>\n<strong>\u0909\u0924\u094d\u0924\u0930-<\/strong> \u0926\u094d\u0930\u0935\u094d\u092f\u092e\u093e\u0928 \u0938\u0902\u0916\u094d\u092f\u093e = (\u092a\u094d\u0930\u094b\u091f\u0949\u0928\u094b\u0902 \u0915\u0940 \u0938\u0902\u0916\u094d\u092f\u093e + \u0928\u094d\u092f\u0942\u091f\u094d\u0930\u0949\u0928\u094b\u0902 \u0915\u0940 \u0938\u0902\u0916\u094d\u092f\u093e)<br \/>\n\u0905\u0924\u0903 X \u0915\u093e \u092a\u0930\u092e\u093e\u0923\u0941 \u0926\u094d\u0930\u0935\u094d\u092f\u092e\u093e\u0928 = 6 + 6 = 12<br \/>\nX \u0915\u0940 \u092a\u0930\u092e\u093e\u0923\u0941 \u0938\u0902\u0916\u094d\u092f\u093e = \u092a\u094d\u0930\u094b\u091f\u0949\u0928\u094b\u0902 \u0915\u0940 \u0938\u0902\u0916\u094d\u092f\u093e = 6<br \/>\nY \u0915\u094b \u0926\u094d\u0930\u0935\u094d\u092f\u092e\u093e\u0928 \u0938\u0902\u0916\u094d\u092f\u093e = 6 + 8 = 14<br \/>\nY \u0915\u0940 \u092a\u0930\u092e\u093e\u0923\u0941 \u0938\u0902\u0916\u094d\u092f\u093e = \u092a\u094d\u0930\u094b\u091f\u0949\u0928\u094b\u0902 \u0915\u0940 \u0938\u0902\u0916\u094d\u092f\u093e = 6<br \/>\n\u091a\u0942\u0901\u0915\u093f \u0926\u094b \u092a\u0930\u092e\u093e\u0923\u0941 \u0938\u094d\u092a\u0940\u0936\u0940\u091c\u093c X \u0914\u0930 Y \u0915\u0940 \u092a\u0930\u092e\u093e\u0923\u0941 \u0938\u0902\u0916\u094d\u092f\u093e 6 \u0938\u092e\u093e\u0928 \u0939\u0948 \u092a\u0930\u0902\u0924\u0941 \u0909\u0928\u0915\u0940 \u0926\u094d\u0930\u0935\u094d\u092f\u092e\u093e\u0928 \u0938\u0902\u0916\u094d\u092f\u093e \u0905\u0932\u0917-\u0905\u0932\u0917 12 \u0914\u0930 14 \u0939\u0948\u0964<br \/>\n\u0905\u0924: \u092f\u0947 \u0926\u094b\u0928\u094b\u0902 \u090f\u0915 \u0926\u0942\u0938\u0930\u0947 \u0915\u0947 \u0938\u092e\u0938\u094d\u0925\u093e\u0928\u093f\u0915 \u0939\u0948\u0902 \u0905\u0930\u094d\u0925\u093e\u0924 \u0915\u093e\u0930\u094d\u092c\u0928 \u0915\u0947 \u0938\u092e\u0938\u094d\u0925\u093e\u0928\u093f\u0915 [\\(_{ 12 }^{ 6 }{ C }\\) \u0914\u0930 [\\(_{ 14 }^{ 6 }{ C }\\) \u0939\u0948\u0902\u0964<\/p>\n<p><strong>\u092a\u094d\u0930\u0966 14. \u0928\u093f\u092e\u094d\u0928\u0932\u093f\u0916\u093f\u0924 \u0935\u0915\u094d\u0924\u0935\u094d\u092f\u094b\u0902 \u092e\u0947\u0902 \u0917\u0932\u0924 \u0915\u0947 \u0932\u093f\u090f F \u0914\u0930 \u0938\u0939\u0940 \u0915\u0947 \u0932\u093f\u090f T \u0932\u093f\u0916\u0947\u0902<\/strong><br \/>\n<strong>(a) \u091c\u0947\u0966\u091c\u0947\u0966 \u091f\u0949\u092e\u0938\u0928 \u0928\u0947 \u092f\u0939 \u092a\u094d\u0930\u0938\u094d\u0924\u093e\u0935\u093f\u0924 \u0915\u093f\u092f\u093e \u0925\u093e \u0915\u093f \u092a\u0930\u092e\u093e\u0923\u0941 \u0915\u0947 \u0915\u0947\u0902\u0926\u094d\u0930\u0915 \u092e\u0947\u0902 \u0915\u0947\u0935\u0932 \u0928\u094d\u092f\u0942\u0915\u094d\u0932\u0940\u092f\u0949\u0928\u094d\u0938 \u0939\u094b\u0924\u0947 \u0939\u0948\u0902\u0964<\/strong><br \/>\n<strong>(b) \u090f\u0915 \u0907\u0932\u0947\u0915\u094d\u091f\u094d\u0930\u0949\u0928 \u0914\u0930 \u092a\u094d\u0930\u094b\u091f\u0949\u0928 \u092e\u093f\u0932\u0915\u0930 \u0928\u094d\u092f\u0942\u091f\u094d\u0930\u0949\u0928 \u0915\u093e \u0928\u093f\u0930\u094d\u092e\u093e\u0923 \u0915\u0930\u0924\u0947 \u0939\u0948\u0902\u0964 \u0907\u0938\u0932\u093f\u090f \u092f\u0939 \u0905\u0928\u093e\u0935\u0947\u0936\u093f\u0924 \u0939\u094b\u0924\u093e \u0939\u0948\u0964<\/strong><br \/>\n<strong>(c) \u0907\u0932\u0947\u0915\u094d\u091f\u094d\u0930\u0949\u0928 \u0915\u093e \u0926\u094d\u0930\u0935\u094d\u092f\u092e\u093e\u0928 \u092a\u094d\u0930\u094b\u091f\u0949\u0928 \u0938\u0947 \u0932\u0917\u092d\u0917 \\(\\frac { 1 }{ 2000 }\\) \u0917\u0941\u0923\u093e \u0939\u094b\u0924\u093e \u0939\u0948\u0964<\/strong><br \/>\n<strong>(d) \u0906\u092f\u094b\u0921\u0940\u0928 \u0915\u0947 \u0938\u092e\u0938\u094d\u0925\u093e\u0928\u093f\u0915 \u0915\u093e \u0907\u0938\u094d\u0924\u0947\u092e\u093e\u0932 \u091f\u093f\u0902\u0915\u094d\u091a\u0930 \u0906\u092f\u094b\u0921\u0940\u0928 \u092c\u0928\u093e\u0928\u0947 \u092e\u0947\u0902 \u0939\u094b\u0924\u093e \u0939\u0948\u0964 \u0907\u0938\u0915\u093e \u0909\u092a\u092f\u094b\u0917 \u0926\u0935\u093e \u0915\u0947 \u0930\u0942\u092a \u092e\u0947\u0902 \u0939\u094b\u0924\u093e \u0939\u0948\u0964<\/strong><br \/>\n<strong>\u0909\u0924\u094d\u0924\u0930-<\/strong><br \/>\n(d) F<br \/>\n(b) F<br \/>\n(c) T<br \/>\n(d) F<\/p>\n<p><strong>\u092a\u094d\u0930\u0936\u094d\u0928 \u0938\u0902\u0916\u094d\u092f\u093e 15, 16 \u0914\u0930 17 \u092e\u0947\u0902 \u0938\u0939\u0940 \u0915\u0947 \u0938\u093e\u092e\u0928\u0947 (\u2713) \u0915\u093e \u091a\u093f\u0939\u094d\u0928 \u0914\u0930 \u0917\u0932\u0924 \u0915\u0947 \u0938\u093e\u092e\u0928\u0947 (\u2717) \u0915\u093e \u091a\u093f\u0939\u094d\u0928 \u0932\u0917\u093e\u0907\u090f\u0964<\/strong><\/p>\n<p><strong>\u092a\u094d\u0930\u0966 15. \u0930\u0926\u0930\u092b\u094b\u0930\u094d\u0921 \u0915\u093e \u0905\u0932\u094d\u092b\u093e \u0915\u0923 \u092a\u094d\u0930\u0915\u0940\u0930\u094d\u0923\u0928 \u092a\u094d\u0930\u092f\u094b\u0917 \u0915\u093f\u0938\u0915\u0940 \u0916\u094b\u091c \u0915\u0947 \u0932\u093f\u090f \u0909\u0924\u094d\u0924\u0930\u0926\u093e\u092f\u0940 \u0925\u093e?<\/strong><br \/>\n<strong>(a) \u092a\u0930\u092e\u093e\u0923\u0941\u0915 \u0915\u0947\u0902\u0926\u094d\u0930\u0915<\/strong><br \/>\n<strong>(b) \u0907\u0932\u0947\u0915\u094d\u091f\u094d\u0930\u0949\u0928<\/strong><br \/>\n<strong>(c) \u092a\u094d\u0930\u094b\u091f\u0949\u0928<\/strong><br \/>\n<strong>(d) \u0928\u094d\u092f\u0942\u091f\u094d\u0930\u0949\u0928<\/strong><br \/>\n<strong>\u0909\u0924\u094d\u0924\u0930-<\/strong><br \/>\n(a) (\u2713)<br \/>\n(b) ( )<br \/>\n(c) ( )<br \/>\n(d) ( )<\/p>\n<p><strong>\u092a\u094d\u0930\u0966 16. \u090f\u0915 \u0924\u0924\u094d\u0924\u094d\u0935 \u0915\u0947 \u0938\u092e\u0938\u094d\u0925\u093e\u0928\u093f\u0915 \u092e\u0947\u0902 \u0939\u094b\u0924\u0947 \u0939\u0948\u0902<\/strong><br \/>\n<strong>(a) \u0938\u092e\u093e\u0928 \u092d\u094c\u0924\u093f\u0915 \u0917\u0941\u0923<\/strong><br \/>\n<strong>(b) \u092d\u093f\u0928\u094d\u0928 \u0930\u093e\u0938\u093e\u092f\u0928\u093f\u0915 \u0917\u0941\u0923<\/strong><br \/>\n<strong>(c) \u0928\u094d\u092f\u0942\u091f\u094d\u0930\u0949\u0928\u094b\u0902 \u0915\u0940 \u0905\u0932\u0917-\u0905\u0932\u0917 \u0938\u0902\u0916\u094d\u092f\u093e<\/strong><br \/>\n<strong>(d) \u092d\u093f\u0928\u094d\u0928 \u092a\u0930\u092e\u093e\u0923\u0941 \u0938\u0902\u0916\u094d\u092f\u093e<\/strong><br \/>\n<strong>\u0909\u0924\u094d\u0924\u0930-<\/strong><br \/>\n(a) ( )<br \/>\n(b) ( )<br \/>\n(c) (\u2713)<br \/>\n(d) ( )<\/p>\n<p><strong>\u092a\u094d\u0930\u0966 17. Cl &#8211; \u0906\u092f\u0928 \u092e\u0947\u0902 \u0938\u0902\u092f\u094b\u091c\u0915\u0924\u093e-\u0907\u0932\u0947\u0915\u094d\u091f\u094d\u0930\u0949\u0928\u094b\u0902 \u0915\u0940 \u0938\u0902\u0916\u094d\u092f\u093e \u0939\u0948<\/strong><br \/>\n<strong>(a) 16<\/strong><br \/>\n<strong>(b) 8<\/strong><br \/>\n<strong>(c) 17<\/strong><br \/>\n<strong>(d) 18<\/strong><br \/>\n<strong>\u0909\u0924\u094d\u0924\u0930-<\/strong><br \/>\n(d) ( )<br \/>\n(b) (\u2713)<br \/>\n(c) ( )<br \/>\n(d) ( )<\/p>\n<p><strong>\u092a\u094d\u0930\u0966 18. \u0938\u094b\u0921\u093f\u092f\u092e \u0915\u093e \u0938\u0939\u0940 \u0907\u0932\u0947\u0915\u094d\u091f\u094d\u0930\u0949\u0928\u093f\u0915 \u0935\u093f\u0928\u094d\u092f\u093e\u0938 \u0928\u093f\u092e\u094d\u0928 \u092e\u0947\u0902 \u0915\u094c\u0928 \u0938\u093e \u0939\u0948?<\/strong><br \/>\n<strong>(a) 2, 8<\/strong><br \/>\n<strong>(b) 8, 2, 1<\/strong><br \/>\n<strong>(c) 2, 1, 8<\/strong><br \/>\n<strong>(d) 2, 8, 1<\/strong><br \/>\n<strong>\u0909\u0924\u094d\u0924\u0930-<\/strong><br \/>\n(d) 2, 8, 1<\/p>\n<p><strong>\u092a\u094d\u0930\u0966 19. \u0928\u093f\u092e\u094d\u0928 \u0938\u093e\u0930\u0923\u0940 \u0915\u094b \u092a\u0942\u0930\u093e \u0915\u0940\u091c\u093f\u090f-<\/strong><br \/>\n<img loading=\"lazy\" src=\"https:\/\/i2.wp.com\/farm2.staticflickr.com\/1815\/43832751252_fc9f0fa1f5_o.png?resize=542%2C226&#038;ssl=1\" alt=\"NCERT Solutions for Class 9 Science Chapter 4 (Hindi Medium) 17\" width=\"542\" height=\"226\" data-recalc-dims=\"1\" \/><br \/>\n<strong>\u0909\u0924\u094d\u0924\u0930-<\/strong><br \/>\n<img loading=\"lazy\" src=\"https:\/\/i1.wp.com\/farm1.staticflickr.com\/941\/28944568547_e59c50fd23_o.png?resize=547%2C202&#038;ssl=1\" alt=\"NCERT Solutions for Class 9 Science Chapter 4 (Hindi Medium) 18\" width=\"547\" height=\"202\" data-recalc-dims=\"1\" \/><\/p>\n<p>Hope given NCERT Solutions for Class 9 Science Chapter 4\u00a0are helpful to complete your homework.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>NCERT Solutions for Class 9 Science Chapter 4 Structure of the Atom (Hindi Medium) These Solutions are part of NCERT Solutions for Class 9 Science in Hindi Medium. Here we have given NCERT Solutions for Class 9 Science Chapter 4 Structure of the Atom. \u092a\u093e\u0920\u0917\u0924 \u0939\u0932 \u092a\u094d\u0930\u0936\u094d\u0928 (NCERT IN-TEXT QUESTIONS SOLVED) NCERT \u092a\u093e\u0920\u094d\u092f\u092a\u0941\u0938\u094d\u0924\u0915 (\u092a\u0943\u0937\u094d\u0920 \u0938\u0902\u0916\u094d\u092f\u093e &hellip;<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"https:\/\/ncertsolutions.guru\/ncert-solutions-for-class-9-science-chapter-4-hindi\/\"> <span class=\"screen-reader-text\">NCERT Solutions for Class 9 Science Chapter 4 Structure of the Atom (Hindi Medium)<\/span> Read More &raquo;<\/a><\/p>\n","protected":false},"author":9,"featured_media":7144,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"spay_email":""},"categories":[6],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v16.7 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>NCERT Solutions for Class 9 Science Chapter 4 Structure of the Atom (Hindi Medium) - NCERT Solutions<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/ncertsolutions.guru\/ncert-solutions-for-class-9-science-chapter-4-hindi\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"NCERT Solutions for Class 9 Science Chapter 4 Structure of the Atom (Hindi Medium) - NCERT Solutions\" \/>\n<meta property=\"og:description\" content=\"NCERT Solutions for Class 9 Science Chapter 4 Structure of the Atom (Hindi Medium) These Solutions are part of NCERT Solutions for Class 9 Science in Hindi Medium. Here we have given NCERT Solutions for Class 9 Science Chapter 4 Structure of the Atom. \u092a\u093e\u0920\u0917\u0924 \u0939\u0932 \u092a\u094d\u0930\u0936\u094d\u0928 (NCERT IN-TEXT QUESTIONS SOLVED) NCERT \u092a\u093e\u0920\u094d\u092f\u092a\u0941\u0938\u094d\u0924\u0915 (\u092a\u0943\u0937\u094d\u0920 \u0938\u0902\u0916\u094d\u092f\u093e &hellip; NCERT Solutions for Class 9 Science Chapter 4 Structure of the Atom (Hindi Medium) Read More &raquo;\" \/>\n<meta property=\"og:url\" content=\"https:\/\/ncertsolutions.guru\/ncert-solutions-for-class-9-science-chapter-4-hindi\/\" \/>\n<meta property=\"og:site_name\" content=\"NCERT Solutions\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/NCERTSolutionsGuru\/\" \/>\n<meta property=\"article:published_time\" content=\"2021-07-23T05:38:37+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2021-07-23T06:43:03+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/ncertsolutions.guru\/wp-content\/uploads\/2018\/08\/NCERT-Solutions-for-Class-9-Science-Chapter-4-Structure-of-the-Atom-Hindi-Medium.png\" \/>\n\t<meta property=\"og:image:width\" content=\"1280\" \/>\n\t<meta property=\"og:image:height\" content=\"720\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@ncertsolguru\" \/>\n<meta name=\"twitter:site\" content=\"@ncertsolguru\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Prasanna\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Organization\",\"@id\":\"https:\/\/ncertsolutions.guru\/#organization\",\"name\":\"NCERT Solutions\",\"url\":\"https:\/\/ncertsolutions.guru\/\",\"sameAs\":[\"https:\/\/www.facebook.com\/NCERTSolutionsGuru\/\",\"https:\/\/www.instagram.com\/ncertsolutionsguru\/\",\"https:\/\/www.linkedin.com\/in\/ncertsolutionsguru\/\",\"https:\/\/in.pinterest.com\/ncertsolutionsguru\/\",\"https:\/\/en.wikipedia.org\/wiki\/National_Council_of_Educational_Research_and_Training\",\"https:\/\/twitter.com\/ncertsolguru\"],\"logo\":{\"@type\":\"ImageObject\",\"@id\":\"https:\/\/ncertsolutions.guru\/#logo\",\"inLanguage\":\"en-US\",\"url\":\"https:\/\/i1.wp.com\/ncertsolutions.guru\/wp-content\/uploads\/2020\/05\/NCERT-Solutions.png?fit=460%2C45&ssl=1\",\"contentUrl\":\"https:\/\/i1.wp.com\/ncertsolutions.guru\/wp-content\/uploads\/2020\/05\/NCERT-Solutions.png?fit=460%2C45&ssl=1\",\"width\":460,\"height\":45,\"caption\":\"NCERT Solutions\"},\"image\":{\"@id\":\"https:\/\/ncertsolutions.guru\/#logo\"}},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/ncertsolutions.guru\/#website\",\"url\":\"https:\/\/ncertsolutions.guru\/\",\"name\":\"NCERT Solutions\",\"description\":\"NCERT Solutions for Class 1 to 12\",\"publisher\":{\"@id\":\"https:\/\/ncertsolutions.guru\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/ncertsolutions.guru\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"en-US\"},{\"@type\":\"ImageObject\",\"@id\":\"https:\/\/ncertsolutions.guru\/ncert-solutions-for-class-9-science-chapter-4-hindi\/#primaryimage\",\"inLanguage\":\"en-US\",\"url\":\"https:\/\/i2.wp.com\/ncertsolutions.guru\/wp-content\/uploads\/2018\/08\/NCERT-Solutions-for-Class-9-Science-Chapter-4-Structure-of-the-Atom-Hindi-Medium.png?fit=1280%2C720&ssl=1\",\"contentUrl\":\"https:\/\/i2.wp.com\/ncertsolutions.guru\/wp-content\/uploads\/2018\/08\/NCERT-Solutions-for-Class-9-Science-Chapter-4-Structure-of-the-Atom-Hindi-Medium.png?fit=1280%2C720&ssl=1\",\"width\":1280,\"height\":720,\"caption\":\"NCERT Solutions for Class 9 Science Chapter 4 Structure of the Atom (Hindi Medium)\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/ncertsolutions.guru\/ncert-solutions-for-class-9-science-chapter-4-hindi\/#webpage\",\"url\":\"https:\/\/ncertsolutions.guru\/ncert-solutions-for-class-9-science-chapter-4-hindi\/\",\"name\":\"NCERT Solutions for Class 9 Science Chapter 4 Structure of the Atom (Hindi Medium) - 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NCERT Solutions","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/ncertsolutions.guru\/ncert-solutions-for-class-9-science-chapter-4-hindi\/","og_locale":"en_US","og_type":"article","og_title":"NCERT Solutions for Class 9 Science Chapter 4 Structure of the Atom (Hindi Medium) - NCERT Solutions","og_description":"NCERT Solutions for Class 9 Science Chapter 4 Structure of the Atom (Hindi Medium) These Solutions are part of NCERT Solutions for Class 9 Science in Hindi Medium. Here we have given NCERT Solutions for Class 9 Science Chapter 4 Structure of the Atom. \u092a\u093e\u0920\u0917\u0924 \u0939\u0932 \u092a\u094d\u0930\u0936\u094d\u0928 (NCERT IN-TEXT QUESTIONS SOLVED) NCERT \u092a\u093e\u0920\u094d\u092f\u092a\u0941\u0938\u094d\u0924\u0915 (\u092a\u0943\u0937\u094d\u0920 \u0938\u0902\u0916\u094d\u092f\u093e &hellip; NCERT Solutions for Class 9 Science Chapter 4 Structure of the Atom (Hindi Medium) Read More &raquo;","og_url":"https:\/\/ncertsolutions.guru\/ncert-solutions-for-class-9-science-chapter-4-hindi\/","og_site_name":"NCERT Solutions","article_publisher":"https:\/\/www.facebook.com\/NCERTSolutionsGuru\/","article_published_time":"2021-07-23T05:38:37+00:00","article_modified_time":"2021-07-23T06:43:03+00:00","og_image":[{"width":1280,"height":720,"url":"https:\/\/ncertsolutions.guru\/wp-content\/uploads\/2018\/08\/NCERT-Solutions-for-Class-9-Science-Chapter-4-Structure-of-the-Atom-Hindi-Medium.png","path":"\/home\/412375.cloudwaysapps.com\/bmvvpkvjjm\/public_html\/wp-content\/uploads\/2018\/08\/NCERT-Solutions-for-Class-9-Science-Chapter-4-Structure-of-the-Atom-Hindi-Medium.png","size":"full","id":7144,"alt":"NCERT Solutions for Class 9 Science Chapter 4 Structure of the Atom (Hindi Medium)","pixels":921600,"type":"image\/png"}],"twitter_card":"summary_large_image","twitter_creator":"@ncertsolguru","twitter_site":"@ncertsolguru","twitter_misc":{"Written by":"Prasanna","Est. reading time":"2 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Organization","@id":"https:\/\/ncertsolutions.guru\/#organization","name":"NCERT Solutions","url":"https:\/\/ncertsolutions.guru\/","sameAs":["https:\/\/www.facebook.com\/NCERTSolutionsGuru\/","https:\/\/www.instagram.com\/ncertsolutionsguru\/","https:\/\/www.linkedin.com\/in\/ncertsolutionsguru\/","https:\/\/in.pinterest.com\/ncertsolutionsguru\/","https:\/\/en.wikipedia.org\/wiki\/National_Council_of_Educational_Research_and_Training","https:\/\/twitter.com\/ncertsolguru"],"logo":{"@type":"ImageObject","@id":"https:\/\/ncertsolutions.guru\/#logo","inLanguage":"en-US","url":"https:\/\/i1.wp.com\/ncertsolutions.guru\/wp-content\/uploads\/2020\/05\/NCERT-Solutions.png?fit=460%2C45&ssl=1","contentUrl":"https:\/\/i1.wp.com\/ncertsolutions.guru\/wp-content\/uploads\/2020\/05\/NCERT-Solutions.png?fit=460%2C45&ssl=1","width":460,"height":45,"caption":"NCERT Solutions"},"image":{"@id":"https:\/\/ncertsolutions.guru\/#logo"}},{"@type":"WebSite","@id":"https:\/\/ncertsolutions.guru\/#website","url":"https:\/\/ncertsolutions.guru\/","name":"NCERT Solutions","description":"NCERT Solutions for Class 1 to 12","publisher":{"@id":"https:\/\/ncertsolutions.guru\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/ncertsolutions.guru\/?s={search_term_string}"},"query-input":"required name=search_term_string"}],"inLanguage":"en-US"},{"@type":"ImageObject","@id":"https:\/\/ncertsolutions.guru\/ncert-solutions-for-class-9-science-chapter-4-hindi\/#primaryimage","inLanguage":"en-US","url":"https:\/\/i2.wp.com\/ncertsolutions.guru\/wp-content\/uploads\/2018\/08\/NCERT-Solutions-for-Class-9-Science-Chapter-4-Structure-of-the-Atom-Hindi-Medium.png?fit=1280%2C720&ssl=1","contentUrl":"https:\/\/i2.wp.com\/ncertsolutions.guru\/wp-content\/uploads\/2018\/08\/NCERT-Solutions-for-Class-9-Science-Chapter-4-Structure-of-the-Atom-Hindi-Medium.png?fit=1280%2C720&ssl=1","width":1280,"height":720,"caption":"NCERT Solutions for Class 9 Science Chapter 4 Structure of the Atom (Hindi Medium)"},{"@type":"WebPage","@id":"https:\/\/ncertsolutions.guru\/ncert-solutions-for-class-9-science-chapter-4-hindi\/#webpage","url":"https:\/\/ncertsolutions.guru\/ncert-solutions-for-class-9-science-chapter-4-hindi\/","name":"NCERT Solutions for Class 9 Science Chapter 4 Structure of the Atom (Hindi Medium) - 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