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(a) `""_(1)^(3)H` तथा `""_(2)^(4)He`,
(b) `""_(28)^(64)Ni` तथा `""_(30)^(64)Zn` में क्या संबंध है ?

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(a) इनकी परमाणु संख्या तथा द्रव्यमान संख्या भिन्न-भिन्न है । इन तत्वों में कोई संबंध नहीं है । इनमे केवल न्यूट्रॉनों की संख्या समान (2) है ।
(b) ये समभारिक है । इनकी द्रव्यमान संख्या समान (64) है ।

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