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

The nucleus of an atom is made up of $X$ protons and $Y$ neutrons. For the most stable and abundant nuclei,

In the radioactive disintegration series ${}_{90}^{232}Th \rightarrow {}_{82}^{208}Pb$ involving $\alpha$ and $\beta$ decay,the total number of $\alpha$ and $\beta$ particles emitted are:

$_{95}Am^{241}$ and $_{90}Th^{234}$ belong respectively to

Which of the following isotopes is likely to be most stable?

Radioactive disintegration differs from a chemical change in being