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एक नाभिक से `beta`- कण क्षय होता है उनकी द्रव्यमान संख्या और परमाणुओं में क्या परिवर्तन होता है?

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द्रव्यमान संख्या में कोई परिवर्तन नहीं होता किंतु परमाणु क्रमांक 1 से बढ़ जाता है।

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