Which of the following particles are constituents of the nucleus?

Weak nuclear force always operates between

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 $\sqrt{A} \propto R^{1 / 6}$.

The force between two protons is the same as the force between a proton and a neutron. The nature of the force is:

Among the fundamental forces, which one of the following is the strongest force?

Define isotopes,isobars,and isotones.