deuterium
Naturally occurring heavy isotope of hydrogen, mass number 2 (one proton and one neutron), discovered by US chemist Harold Urey in 1932. It is sometimes given the symbol D. In nature, about one in every 6,500 hydrogen atoms is deuterium. Combined with oxygen, it produces ‘heavy water’ (D2O), used in the nuclear industry.
© RM 2012. Helicon Publishing is division of RM.
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