What is molybdenum?

  • (noun): A polyvalent metallic element that resembles chromium and tungsten in its properties; used to strengthen and harden steel.
    Synonyms: Mo, atomic number 42


Molybdenum is a Group 6 chemical element with the symbol Mo and atomic number 42. The name is from Neo-Latin Molybdaenum, from Ancient Greek Μόλυβδος molybdos, meaning lead, since its ores were confused with lead ores. Molybdenum minerals have been known into prehistory, but the element was "discovered" (in the sense of differentiating it as a new entity from the mineral salts of other metals) in 1778 by Carl Wilhelm Scheele. The metal was first isolated in 1781 by Peter Jacob Hjelm.

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Some articles on molybdenum:

Isopoly Molybdenum Blues
... The isopoly-molybdenum blues have been known for many years ... Molybdenum(VI)oxide, MoO3, when dissolved in aqueous alkali forms the tetrahedral molybdate anion, MoO42− ... The later unit occurs also in the giant mixed-valence molybdenum blue species 48− (x≈16) as well as in the cluster described in the next section ...
Molybdenum - Precautions
... Molybdenum dusts and fumes, which can be generated by mining or metalworking, can be toxic, especially if ingested (including dust trapped in the sinuses and later swallowed) ... Direct inhalation or ingestion of molybdenum and its oxides should be avoided ... OSHA regulations specify the maximum permissible molybdenum exposure in an 8-hour day as 5 mg/m3 ...
Molybdenum Chloride
... Molybdenum chloride can refer to Molybdenum(II) chloride (molybdenum dichloride), MoCl2 Molybdenum(III) chloride (molybdenum trichloride), MoCl3 Molybdenum(IV ...
Climax Mine - Geology
... the ore is low-grade, much less than one percent molybdenum, but the ore bodies are very large ... Beside molybdenum, the mine has also produced tin (from cassiterite), tungsten (from hübnerite), and pyrite as by-products ... The Climax deposit is one of a number of large molybdenum deposits in central Colorado and northern New Mexico ...
Climax Mine - History
... Charles Senter discovered and claimed the outcropping of molybdenite (molybdenum sulfide) veins in 1879, during the Leadville, Colorado, Silver Boom ... Senter finally found a chemist who identified the gray mineral as containing molybdenum in 1895, at the time there was virtually no market for the metal ... When steelmakers found the usefulness of molybdenum as an alloy in producing very hard steel, the first ore shipments from the deposit began in 1915, and the Climax mine began ...