Which of the following is the most stable atom?

Emission is caused by the transformation of one neutron into a proton. This results in the formation of a new element having

The atomic mass of an element is $12.00710 \, amu$. If there are $6$ neutrons in the nucleus of the atom of the element,the binding energy per nucleon of the nucleus will be $....... \, MeV$.
($e^{-} = 0.00055 \, amu$,$p = 1.00814 \, amu$,$n = 1.00893 \, amu$)

Nuclei tend to have more neutrons than protons at high mass numbers because

Starting from radium,the radioactive disintegration process terminates when the following is obtained:

The atom bomb is based on the principle of: