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Deuterium, (D, or 2H), also called heavy hydrogen, isotope of hydrogen with a nucleus consisting of one proton and one neutron, which is double the mass of the nucleus of ordinary hydrogen (one proton). Deuterium has an atomic weight of 2.014.
Deuterium is widely used in prototype fusion reactors and has their application in military, industrial and scientific fields. In nuclear fusion reactors, it is used as a tracer and it is responsible for slowing down neutrons in heavy water moderated fission reactors.