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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.<br />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.