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Title: Chemistry/Elements/Chromium - LANL: Chromium History, sources, uses, and compounds.
Lenntech__Chromium Physical data, chemical properties, health and environmental effects.

USGS_Minerals_Information__Chromium Statistics and information on the worldwide supply, demand, and flow of the element (PDF format).

Visual_Elements__Chromium General and physical information, source, uses, key isotopes, and ionisation energies.

WebElements__Chromium Extensive information on history, uses, occurrence, compounds, and properties of the element.

Wikipedia__Chromium Properties of the element, including its history, applications, and characteristics.

Radiochemistry_of_Chromium Full text of the monograph by J. Pijck (Laboratory for Analytical Chemistry, University of Ghent, Ghent, Belgium). (December, 1964)

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Chromium /* No Right Click Copyright Mike McGrath (http://website.lineone.net/~mike_mcgrath/) To add more shock to your site, visit www.DHTML Shock.com */ Back to the Periodic Table         Chromium Atomic Number: 24 Atomic Radius: 124.9 pm Atomic Symbol: Cr Melting Point: 1907 șC Atomic Weight: 51.996 Boiling Point: 2671 șC Electron Configuration: [Ar]4s13d5 Oxidation States: 6, 3, 2

History

(Gr. chroma: color) Discovered in 1797 by Vauquelin, who prepared the metal in the following year, chromium is a steel-gray, lustrous, hard metal that takes a high polish.

Sources

The principal ore is chromite, which is found in Zimbabwe, Russia, New Zealand, Turkey, Iran, Albania, Finland, Democratic Republic of Madagascar, and the Phillippines. The metal is usually produced by reducing the oxide with aluminum.

Uses

Chromium is used to harden steel, manufacture stainless steel, and form many useful alloys. It is mostly used in plating to produce a hard, beautiful surface and to prevent corrosion. Chromium gives glass an emerald green color and is widely used as a catalyst. The refractory industry uses chromite  for forming bricks and shapes, as it has a high melting point, moderate thermal expansion, and stability of crystalline structure.

Compounds

All compounds of chromium are colored. The most important chromates are those of sodium and potassium, the dichromates, and the potassium and ammonium chrome alums. The dichromates are used as oxidizing agents in quantitative analysis, also in tanning leather. Other compounds are of industrial value; lead chromate is chrome yellow, a valued pigment. Chromium compounds are used in the textile industry as mordants, and by the aircraft and other industries for anodizing aluminum.

Handling

Chromium compounds are toxic and should be handled with proper safeguards. Title Picture: Chrome blob Sources: CRC Handbook of Chemistry and Physics and the American Chemical Society. Chemistry Division HomeLANL Home Last Updated: 12/15/2003,© Chemistry Operations Operated by the University of California for the US Department of Energy   | Help | Copyright © UC 2003 | Disclaimer  
 

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