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`""_(Z)^(A)X` के रेडियोऐक्टिव विघटन की श्रेणी में पहले `alpha`- कण तत्पश्चात `beta`- कण उत्सर्जित होता 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)`.
परमाणु क्रमांक Z - 1 तथा द्रव्यमान संख्या A - 4.

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