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Chromium is a lustrous, hard steel-grey metal. It has the symbol of Cr and the atomic number 24. The pure metal is brittle and magnetic, but when alloyed, it can be malleable. Chromium is also found in chromium compounds, chromates and in chromic acid. Most chromium compounds have been classified as either Category 1A or Category 1B carcinogens: presumed or shown to cause cancer in humans. [1,2,3,4]
