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After $1 α and 2 β$ emissions

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Mass number reduces by 3

Mass number reduces by 4

Mass number reduces by 6

Atomic number reduces by 2.

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Correct option is B

X A Z →αY A-4 Z-2 →2βX A-4 Z

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After 1α and 2β emissions

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After $1 α and 2 β$ emissions