Chromium

[kroh-mee-uh m] /ˈkroʊ mi əm/

noun
1.
a lustrous, hard, brittle, metallic element used in alloy steels for hardness and corrosion resistance, as in stainless steel, and for plating other metals: chromium salts are used as pigments and mordants. Symbol: Cr; atomic weight: 51.996; atomic number: 24; specific gravity: 7.1.
2.
(def 2).
/ˈkrəʊmɪəm/
noun
1.
a hard grey metallic element that takes a high polish, occurring principally in chromite: used in steel alloys and electroplating to increase hardness and corrosion-resistance. Symbol: Cr; atomic no: 24; atomic wt: 51.9961; valency: 2, 3, or 6; relative density: 7.18–7.20; melting pt: 1863±20°C; boiling pt: 2672°C
n.

metallic element, 1807, with metallic elemental suffix -ium + French chrome (Fourcroy and Haüy), from Greek chroma “color” (see chrome; also see chroma). So called for its colorful compounds. Related: Chromite.

chromium chro·mi·um (krō’mē-əm)
n.
Symbol Cr
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.
chromium
(krō’mē-əm)
Symbol Cr
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.