Question

When a nucleus, having atomic number $Z$ and mass number $A$, undergoes a radioactive decay process,

1) Both $Z$ and $A$ will decrease, if the process is $\alpha$ decay.
2.) $Z$ will decrease but $A$ will not change, if the process is ${\beta }^{+}$ decay.
3.) $Z$ will increase but $A$ will not change, if the process is ${\beta }^{-}$ decay
4.) $Z$ and $A$ will remain unchanged, if the process is $\gamma$ decay

• A. 1 & 2 are true
• B. 3 & 4 are true
• C. 1, 2 & 3 are true
• D. All are true

Answer 1

The correct option is D All are true

The statements 1, 2, 3 and 4 are the effects of the $\alpha$decay, ${\beta }^{+}-$decay,${\beta }^{-}$decay and $\gamma -$ decay respectively.

Hence, $\left(D\right)$ is the correct answer.