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The total number of isotopes of hydrogen

Question:

The total number of isotopes of hydrogen and number of radioactive isotopes among them, respectively, are :

  1. 2 and 0

  2. 3 and 2

  3. 3 and 1

  4. 2 and 1


Correct Option: , 3

Solution:

Total number of isotopes of hydrogen is 3

$\Rightarrow{ }_{1}^{1} \mathrm{H},{ }_{1}^{2} \mathrm{H}$ or ${ }_{1}^{2} \mathrm{D},{ }_{1}^{3} \mathrm{H}$ or ${ }_{1}^{3} \mathrm{~T}$

and only ${ }_{1}^{3} \mathrm{H}$ or ${ }_{1}^{3} \mathrm{~T}$ is an Radioactive element.

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