A radioactive nucleus undergoes a series of decay according to the scheme
$A\xrightarrow{\alpha }{{A}_{1}}\xrightarrow{\beta }{{A}_{2}}\xrightarrow{\alpha }{{A}_{3}}\xrightarrow{\gamma }{{A}_{4}}$
If the mass number and atomic number of $A$ are $180$ and $72$ respectively, then what are these number for $A_4$
$172$ and $69$
$174$ and $70$
$176$ and $69$
$176$ and $70$
In which of the following nuclear reactions, the product is incorrectly matched ?
${ }_{92}^{238} U$ atom disintegrates to ${ }_{84}^{214} Po$ with a half of $45 \times 10^9$ years by emitting $\operatorname{six} \alpha-$ particles and $n$ electrons. Here, $n$ is
$\gamma$-decay occurs when
$\alpha$ -particle consists of
When a nucleus with atomic number $Z$ and mass number $A$ undergoes a radioactive decay process :