Molybdenum

Molybdenum is a lustrous silvery coloured metal. In many instances, it shows a resemblance to tungsten with which it tends to be paired in the transition series in the periodic table, but their chemistries tend to show more distinct differences than might be expected. Molybdenum has a high melting point and applications for the pure metal take advantage of this; for example, the pure material is used as resistance heating elements in furnaces, as filament supports in electric lamps, and as electrodes for mercury vapour lamps. Molybdenum is used as an alloying agent in certain grades of steel, Permalloys and Stellites (a series of alloys which contain varying proportions of Cr, Co, W and Mo, are very hard and are used in cutting tools and to protect surfaces subject to heavy wear).


Symbol
Mo

Discovered
1871 by P.J. Hjelm in Uppsala, Sweden.

Abundance
1.5 ppm in the earth’s crust.

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Atomic number 42 Clip
Atomic / Molecular Weight 95.94 gmol-1Clip
Density 10222 kgm-3Clip
Crystal Structure bcc Clip
Lattice constant 315 fmClip
Melting Point 2896 KClip
Boiling Point 4903 KClip
Linear expansivity 0.0000052 K-1Clip
Specific heat capacity 251 Jkg-1K-1Clip
Thermal conductivity 139 Wm-1K-1Clip
Bulk Modulus of Rigidity 231000000000 Nm-2Clip
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See also: Molybdate, Periodic Table.

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Subjects: Chemistry