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Doc Croc.
May 26, 2014

deuterium, symbol D, is an isotope of Hydrogen.

Hydrogen has three isotopes. Most hydrogen atoms have one proton and one electron and no neutrons, so have a mass number of 1. Deuterium atoms have 1 proton and 1 neutron in the nucleus, so a mass number of 2. They are chemically identical to hydrogen, but heavier.

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