Which element is the end product of each natural radioactive series?

In a nuclide, one $a.m.u.$ of mass is dissipated into energy to bind its nucleons. The energy equivalent of this mass is

The nuclear binding energy for $Ar$ $(39.962384 \, amu)$ is ......... $MeV.$ (Given: mass of proton $= 1.007825 \, amu$,mass of neutron $= 1.008665 \, amu$)

Which atomic species cannot be used as a nuclear fuel?

Radioactive isotopes that have an excessive neutron/proton ratio generally exhibit

In a nuclear reactor,the chain reaction is controlled by introducing: