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chromium chro·mi·um (krō'mē-əm)
A lustrous hard metallic element, resistant to tarnish and corrosion and found primarily in chromite. It is used to harden steel alloys, in decorative platings, and as a pigment in glass. Atomic number 24; atomic weight 51.996; melting point 1,907°C; boiling point 2,671°C; specific gravity 7.18; valence 2, 3, 6.
A hard, shiny, steel-gray metallic element that is rust-resistant and does not tarnish easily. It is used to plate other metals, to harden steel, and to make stainless steel and other alloys. Atomic number 24; atomic weight 51.996; melting point 1,890°C; boiling point 2,482°C; specific gravity 7.18; valence 2, 3, 6. See Periodic Table.