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When a nucleus with atomic number \( \mathrm{Z} \) and mass number A undergoes a radioactive decay process:
(A) both \( \mathrm{Z} \) and \( \mathrm{A} \) will decrease, if the process is \( \alpha \) decay
\( \mathrm{P} \)
(B) \( \mathrm{Z} \) will decrease but \( \mathrm{A} \) will not change, if the process is \( \beta^{+} \)decay
(C) \( \mathrm{Z} \) will decrease but \( A \) will not change, if the process is \( \beta^{-} \)decay
W
(D) \( \mathrm{Z} \) and \( \mathrm{A} \) will remain unchanged, if the process is \( \gamma \) decay.
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