Question
Heavy water is
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Answer
Heavy water is water that contains heavy hydrogen or deuterium. Deuterium differs from the hydrogen usually found in water, protium, in that each atom of deuterium contains a proton and a neutron. Heavy water may be deuterium oxide, $D _2 O$ or it may be deuterium protium oxide,$DHO$. Heavy water occurs naturally, although it is much less common than regular water.
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