Deuterium

An isotope of hydrogen that contains one neutron and one proton in its nucleus. In normal water a deuterium atom occurs in 1 in 6,500 hydrogen atoms.

Discovered

Harold C. Urey, F. G. Brickwedde, and G. M. Murphy.

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Mass number	2		Clip
Atomic / Molecular Weight	2.014102	gmol-1	Clip

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See also: Heavy Water, Hydrogen, Tritium.