Question:

The isotopes of hydrogen are :

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Hydrogen has three naturally known isotopes with mass numbers 1, 2 and 3.
Updated On: Nov 5, 2026
  • Tritium and protium only
  • Protium and Deuterium only
  • Protium, deuterium and tritium
  • Deuterium and tritium only
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The Correct Option is C

Solution and Explanation

Hydrogen has three isotopes, all with one proton (Z = 1):
protium (\(\mathrm{^1H}\), no neutron), deuterium (\(\mathrm{^2H}\) or D, one neutron) and tritium (\(\mathrm{^3H}\) or T, two neutrons, radioactive).
So all three are isotopes of hydrogen.
Answer: (3) Protium, deuterium and tritium
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