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

Positron emission results from the transformation of one nuclear proton into a neutron. The isotope thus produced possesses

During the emission of a positron from a nucleus,the mass number of the daughter element remains the same but the atomic number

The binding energy of $_8O^{16}$ is $127 \ MeV$. Its binding energy per nucleon is ...... $MeV$.

The nucleus of a radioactive element possesses:

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: