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A deuterium nucleus; namely, a proton and a neutron. It is used in nuclear applications, such as the bombardment of molybdenum plates to create [technetium] plates. With an [electron], it forms the stable hydrogen isotope of deuterium or "heavy hydrogen", symbol D, atomic wt. 2. Water with both hydrogens replaced by deuterium is called "[heavy water]" (D2O), and is used as a moderator in the harnessing of nuclear fuels.
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