deuterium

deuterium (dtēr`ēəm), isotope of hydrogen with mass no. 2. The deuterium nucleus, called a deuteron, contains one proton and one neutron. Deuterium is also called heavy hydrogen, and water in which the hydrogen atoms are deuterium is called heavy water (deuterium oxide, D₂O). Deuterons are sometimes used in particle accelerators, and heavy water is used in "swimming pool" nuclear reactors as a moderator.

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deuterium

 or heavy hydrogen

Isotope of hydrogen, chemical symbol ²H or D, atomic number 1 (but atomic weight approximately 2). Harold C. Urey won a Nobel Prize for its discovery and isolation. Its nucleus contains one proton and one neutron. A stable substance found in naturally occurring hydrogen compounds to the extent of about 0.015%, deuterium can be purified by distillation of hydrogen or by electrolysis of water. It enters into all the same chemical reactions as ordinary hydrogen; it forms D₂ and HD, analogous to molecular hydrogen (H₂), and D₂O (heavy water), analogous to ordinary water (H₂O). Nuclear fusion of deuterium atoms or of deuterium and tritium at high temperatures releases enormous amounts of energy. Such reactions have been used in nuclear weapons and experimental power reactors. Deuterium is useful as a tracer in research into reaction mechanisms and biochemical pathways.

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deuterium

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.

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deuterium [dü′tir·ē·əm]

(chemistry)

The isotope of the element hydrogen with one neutron and one proton in the nucleus; atomic weight 2.0144. Designated D, d, H², or²H.