A) \[_{n}{{X}^{m-4}}\]
B) \[_{n-1}{{X}^{m-1}}\]
C) \[_{n}{{Z}^{m-4}}\]
D) None of these
Correct Answer: A
Solution :
If an \[\alpha \]-particle emits from radioactive element its atomic number decreases by 2 unit and mass number decreases by 4 unit. If one \[\beta \]-particle emits from radioactive element its atomic number increases by 1 unit and mass number remains same. \[_{n}{{X}^{m}}{{\xrightarrow{-\alpha }}_{n-2}}{{X}^{m-4}}{{\xrightarrow{-2\beta }}_{n}}{{X}^{m-4}}\]
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