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किसी रेडियोएक्‍टिव नाभिक `._(Z)X^(A)` से एक `alpha-` क्षय, फिर `beta`-क्षय, `gamma`- क्षय तथा अन्त में `beta`-क्षय होता है। अन्‍तिम नाभिक का परमाणु क्रमांक तथा द्रव्यमान संख्या क्या होगी?

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परमाणु क्रमांक `=Z-2+1+-0+1=Z`
द्रव्यमान संख्या `=A-4+0+-0+0=A-4`

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