A) Mass number reduces by 3
B) Mass number reduces by 4
C) Mass number reduces by 6
D) Atomic number remains unchanged
Correct Answer: B
Solution :
\[_{Z}{{X}^{A}}{{\xrightarrow{\alpha }}_{Z-2}}{{Y}^{A-4}}{{\xrightarrow{2\beta }}_{Z}}{{X}^{A-4}}\]
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