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Q. Radioactive isotope of hydrogen is

Rajasthan PMTRajasthan PMT 2007Hydrogen

Solution:

(i) Tritium $\left({ }_{1}^{3} H \right)$ is the radioactive isotope of hydrogen. It has $\dot{n} / p$ ratio $=2.0$. So, it is unstable.
(ii) Deuterium $\left({ }_{1}^{2} H\right)$ is heavy hydrogen, another isotope of hydrogen.