Question

Isotope(s) of hydrogen which emits low energy $\beta$- particles with $t_{1/2}$ value > $12$ years is/are

<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> JEE MAIN 2021

Answer 1

Tritium ${(}_1^{{}^3}HorT)$ isotope of hydrogen is radioactive and emits low energy β-particle.
It has one proton and two neutrons in the nucleus.
${}_1^{{}^1}H$ and ${}_1^{{}^2}H$ are stable while ${}_1^{{}^3}H$ is radioactive.
Hence, option (b) is correct.