In the decay,${}_Z^AX \to {}_{6}^{12}C + {}_{+1}^{0}\beta$,identify the values of $A$ and $Z$.

The number of neutrons in a parent nucleus $X$,which gives a $_7N^{14}$ nucleus after two successive $\beta$ emissions,is:

In a radioactive decay,an emitted electron comes from

When nuclear energy is intended to be harnessed for the generation of electricity,the potentially destructive neutrons released in a nuclear reactor are absorbed by:

If ${}^{235}U$ is bombarded with neutrons,the atom will split into:

Atom $A$ possesses higher values of packing fraction than atom $B$. The relative stabilities of $A$ and $B$ are