The radioactive isotope of hydrogen is

protium

deuterium

tritium

hydronium

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UPSC CDS-2 – 2020

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Tritium (³H) is the radioactive isotope of hydrogen. It contains one proton and two neutrons.

Hydrogen has three naturally occurring isotopes: Protium (¹H, 1 proton, 0 neutrons), Deuterium (²H or D, 1 proton, 1 neutron), and Tritium (³H or T, 1 proton, 2 neutrons). Protium and Deuterium are stable isotopes.

Tritium is a beta emitter with a relatively short half-life of approximately 12.3 years. Hydronium (H₃O⁺) is a polyatomic cation formed when a proton (H⁺) is added to a water molecule (H₂O); it is not an isotope of hydrogen.

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