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Re: Element of the Day: Molybdenum

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raceman6743 is not online. raceman6743
Joined: 26 Jan 2012
Total Posts: 11937
10 Feb 2017 05:27 PM
Molybdenum is a chemical element with 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 throughout history, 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.

Molybdenum does not occur naturally as a free metal on Earth; it is found only in various oxidation states in minerals. The free element, # silvery metal with # gray cast, has the sixth-highest melting point of any element. It readily forms hard, stable carbides in alloys, and for this reason most of world production of the element (about 80%) is used in steel alloys, including high-strength alloys and superalloys.

Most molybdenum compounds have low solubility in water, but when molybdenum-bearing minerals contact oxygen and water, the resulting molybdate ion MoO2−
4 is quite soluble. Industrially, molybdenum compounds (about 14% of world production of the element) are used in high-pressure and high-temperature applications as pigments and catalysts.


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raceman6743 is not online. raceman6743
Joined: 26 Jan 2012
Total Posts: 11937
10 Feb 2017 05:30 PM
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vikkonn is not online. vikkonn
Joined: 17 Dec 2016
Total Posts: 4808
10 Feb 2017 05:32 PM
Calabi-Yau Manifold.
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