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Sigma KEE - Nitrogen
氮
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Colourless, gaseous element which belongs to group 15 of the periodic table. Constitutes ~78 percent of the atmosphere and is an essential part of the ecosystem. Nitrogen for industrial purposes is acquired by the fractional distillation of liquid air. Chemically inactive, reactive generally only at high temperatures or in electrical discharges. It was discovered in 1772 by D. Rutherford.
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