RUSS LAPPA / SCIENCE PHOTO LIBRARY RUSS LAPPA / SCIENCE PHOTO LIBRARY
Chromium, a hard, silvery transition metal which is extracted from the mineral chromite (a double oxide of iron and chromium). Chromium is used in making alloy steels and as a shiny, decorative, corrosion-resistant, electroplated coating. Chromium was first identified by Vauquelin in 1797 and has the chemical symbol Cr.
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