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`._(92)^(238)U` नाभिक से एक `alpha`- कण उत्सर्जित होता है उसकी द्रव्यमान संख्या और परमाणु क्रमांक में क्या परिवर्तन होता है जबकि वह थोरियम नाभिक में रूपांतरित होता है।

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द्रव्यमान संख्या 4 से एवं परमाणु क्रमांक 2 से कम हो जाता है।

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