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`._(Z)^(A)X` के रेडियोएक्‍टिव विघटन की श्रेणी में पहले `alpha-` कण तत्पशचात `beta`- कण उत्सर्जित हेाता है। इन क्रमागत विघटनों में नए नाभिक का परमाणु क्रमांक तथा द्रव्यमान संख्या क्या है?

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`._(Z)^(A)X overset(alpha)(to)._(Z-2)^(A-4)X_(1)overset(beta)(to)._(Z-1)^(A-4)X_(2)`
नए नाभिक का परमाणु क्रमांक `=Z-1`
द्रव्यमान संख्या `=A-4`

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