At what distance does the minimum value of potential energy be obtained between the nucleons (in $fm$)?

$A$ free neutron decays into a proton,but a free proton does not decay into a neutron. This is because

If the radius of the $_{13}^{27}Al$ nucleus is estimated to be $3.6 \, \text{Fermi}$, then the radius of the $_{52}^{125}Te$ nucleus will be nearly .......... $\text{Fermi}$.

An element consists of a mixture of three isotopes $A$, $B$, and $C$ of masses $m_1$, $m_2$, and $m_3$ respectively. If the relative abundances of the three isotopes $A$, $B$, and $C$ are in the ratio $2:3:5$, the average mass of the element is:

The range of weak nuclear force is of the order of

The strongest force among the following forces in nature is