The force between a proton and a proton in a nucleus is .......

Consider the following two statements, $A$ and $B$ and identify the correct answer given below:
$A$. Nuclear density is same for all nuclei.
$B$. Radius of the nucleus $R$ and its mass number $A$ are related as $\sqrt{A} \propto R^{1 / 6}$.

$A$ nucleus of deuterons or deuterium is a bound atomic system best described by

In the nuclear reaction: $X(n, \alpha) {_3Li^7}$,the term $X$ will be

The composition of an $\alpha$-particle can be expressed as:

The radius of a nucleus of a mass number $A$ is directly proportional to