Three isotopes of hydrogen exist and all occur naturally.
Name | Symbol | Atomic number | mass number | Nature |
---|---|---|---|---|
Protium | `text()_(1)H^1` or `H` | 1 | 1 | Non-radioactive |
Deuterium | `text()_(1)H^2` or `D` | 1 | 2 | Non-radioactive |
Tritium | `text()_(1)H^3` or `T` | 1 | 2 | Radioactive |