Which of the following is the most stable atom?

The end product of the $(4n + 2)$ radioactive disintegration series is:

In the successive emission of $\alpha$- and $\beta$-particles,the number of $\alpha$- and $\beta$-particles that should be emitted for the conversion of ${}^{238}_{92}U$ to ${}^{206}_{82}Pb$ are:

$_{90}Th^{228}$ emits four alpha and one beta particles. The number of neutrons in the daughter element is:

Which of the following is an example of nuclear fission?

India conducted an underground nuclear test at