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

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

Let $m_p$ be the mass of a proton,$m_n$ that of a neutron,$M_1$ that of a $_{10}^{20}Ne$ nucleus,and $M_2$ that of a $_{20}^{40}Ca$ nucleus. Then:

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

Large energy released in an atomic bomb explosion is mainly due to

${}_{90}Th^{232} \rightarrow {}_{82}Pb^{208}$. The number of $\alpha$ and $\beta$-particles emitted during the above reaction is: