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chromium

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chromium

Hard, brittle, grey-white, metallic element, atomic number 24, relative atomic mass 51.996. It takes a high polish, has a high melting point, and is very resistant to corrosion. It is used in chromium electroplating, in the manufacture of stainless steel and other alloys, and as a catalyst. Its compounds are used for tanning leather and for alums. In human nutrition it is a vital trace element. In nature, it occurs chiefly as chrome iron ore or chromite (FeCr2O4). Kazakhstan, Zimbabwe, and Brazil are sources.

The element was named in 1797 by the French chemist Louis Vauquelin after its brightly coloured compounds.



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? Mentioned in ? References in periodicals archive
 
For years, hexavalent chromium compounds have been regulated in many different ways.
The hex: New regulations for hexavalent chromium go into effect in ... by Mattia, Mike / Recycling Today
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The disparity in chromium concentrations develops during the material's cooling process, says Ryan.
Better stainless: analysis could bring pits out of the steel. ... by Perkins, S. / Science News
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