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Heavy water (deuterium oxide (2H 2O) or D 2O) is a form of water that contains a larger than normal amount of the hydrogen isotope deuterium (2H or D, also known as heavy hydrogen), rather than the common hydrogen-1 isotope (1H or H, also called protium) that makes up most of the hydrogen in regular water.
For â¦example water is made up of the  molecule H2O . . . 2 atoms of hydrogen and 1 atom of oxygen for a  total of 3 atoms; however, there is also a substance called  Deuterium or 'heavy' water that is made of 2 double-heavy atoms of  hydrogen and 1 atom of oxygen, but it still contains the same  number of atoms: 3.