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  3. Chemistry
  4. The total number of isotopes of hydrogen and number of radioactive isotopes among them, respectively, are :

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

JEE MainJEE Main 2019Hydrogen

Solution:

Total number of isotopes of hydrogen is 3
$\Longrightarrow{ }_{2}^{1} H ,{ }_{1}^{2} H$ or ${ }_{1}^{3} D ,{ }_{1}^{3} H$ or ${ }_{1}^{3} T$
and only ${ }_{1}^{3} H$ or ${ }_{1}^{3} T$ is a radioactive element.