The isotopes of hydrogen are:

Engineering

Chemistry

Hydrogen Preparation and Properties

Question

Tritium and protium only

Protium, deuterium and tritium

Protium and deuterium only

Deuterium and tritium only

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The isotopes are:

${}_{1}^{1}H, {}_{1}^{2}H and {}_{1}^{3}H \equiv P, D, T$