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D2O, 2 Deuterium, and 1 Oxygen atom. Deuterium is an isotope of hydrogen; it has one extra neutron in the nucleus. Neutrons are what add weight to an atom; this [substance] is called "Heavy Water" as compared to normal "Light Water." Heavy water exists is most all water, but only in [very small] amounts (1 in 20 million). Heavy water is [essential] to nuclear power using non-enriched uranium. Without it, all uranium must be enriched before use. In WW-II, Hitler attacked Norway for it’s supply of heavy water.
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