Question

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

• A. Protium
• B. Tritium
• C. Deuterium
• D. Deuterium and Tritium

Answer 1

The correct option is B Tritium

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.