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एक ही तत्व की समान परमाणु संख्या किन्तु भिन्न परमाणु भार वाले परमाणु कहलाते हैं ।

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एक ही तत्व की समान परमाणु संख्या किन्तु भिन्न परमाणु भार वाले परमाणु कहलाते हैं ।






 
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