Heavy water (deuterium oxide, 2H2O, D2O) is a form of water in which all hydrogen atoms are hydrogen-2 isotope or deuterium (2H or D, also known as heavy hydrogen) rather than the common hydrogen-1 isotope (1H, also called protium) that makes up most of the hydrogen in normal water. The presence of the heavier isotope gives the water different nuclear properties, and the increase in mass gives it slightly different physical and chemical properties when compared to normal water.
Heavy water (deuterium oxide, 2H2O, D2O) is a form of water in which all hydrogen atoms are hydrogen-2 isotope or deuterium (2H or D, also known as heavy hydrogen) rather than the common hydrogen-1 isotope (1H, also called protium) that makes up most of the hydrogen in normal water. The presence of the heavier isotope gives the water different nuclear properties, and the increase in mass gives it slightly different physical and chemical properties when compared to normal water.
Source: Wikipedia "Heavy water" · CC BY-SA 4.0
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