deuterium(redirected from H 2)
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A naturally occurring isotope of hydrogen, H-2, having one proton and one neutron in the nucleus.
(Elements & Compounds) a stable isotope of hydrogen, occurring in natural hydrogen (156 parts per million) and in heavy water: used as a tracer in chemistry and biology. Symbol: D or 2H; atomic no: 1; atomic wt: 2.014; boiling pt: –249.7°C
[C20: New Latin; see deutero-, -ium; from the fact that it is the second heaviest hydrogen isotope]
deu•te•ri•um(duˈtɪər i əm, dyu-)
an isotope of hydrogen, having twice the mass of ordinary hydrogen; heavy hydrogen. Symbol: D; at. wt.: 2.01; at. no.: 1.
[1933; < Greek deúter(os) second (see deutero-)]
An isotope of hydrogen. Its nucleus contains one proton and one neutron and has a relative atomic mass of two.