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Chromium is a hard, lustrous steelgray metal that was discovered in 1797. Found primarily in chromite ore, it is usually produced by reducing the oxide with aluminum. Chromium is used to harden steel, make stainless steel, and form other alloys. In plating, it produces a hard, smooth surface that resists corrosion.

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Molecular weights can be found in the NIOSH Pocket Guide to Chemical Hazards, chemical supplier lists, the NIST Chemistry WebBook or other online databases.. The numeric value of in both formulae is the molar volume of air in litres at normal temperature and pressure (NTP), which is considered to be 25ºC and 1 atmosphere ( kPa or 760 mm Hg or 760 torr).