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दो तत्वों की परमाणु संख्या समान है, किन्तु इनके गुण भिन्न-भिन्न हैं । ये ……… कहलाते हैं ।

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दो तत्वों की परमाणु संख्या समान है, किन्तु इनके गुण भिन्न-भिन्न हैं । ये ……… कहलाते हैं ।






 
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