Why is heavy water heavy?

Because heavy water is D 2 O and not H 2 O; the hydrogen atomic nucleus has only one proton, the deuterium has one proton and one neutron. Consequently the properties of the two isotopes are very different. The deuterated water is more dense than the normal water (1,1056 g/cm 3 for D 2 O and 0,9982 g/cm 3 for H 2 O.

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