Hydrogen has three isotopes: protium (1/1 H), deuterium (2/1 H or D), and tritium (3/1 H or T).
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Hydrogen has three isotopes: protium (1/1 H), deuterium (2/1 H or D), and tritium (3/1 H or T).
Hydrogen has three isotopes: protium (¹H), deuterium (²H), and tritium (³H). Protium is the most abundant, deuterium is stable, and tritium is radioactive with a half-life of about 12 years.