Molybdenum - Periodic Table of the Elements

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PERIODIC TABLE OF THE ELEMENTS version 1.7


 Mo

English:  Molybdenum
French: Molybdène
Croatian: Molibden
German: Molybdän
Italian: Molibdeno


Atomic number: 42
Group numbers: 6
Period: 5
Standard state (20 °C): solid

Molybdenum was discovered by Carl William Scheele (Sweden) in 1778. The origin of the name comes from the Greek word molybdos meaning lead. It is silvery white, very hard metal, but is softer and more ductile than tungsten.

Electronic configuration: [Kr] 4d⁵ 5s¹
Relative atomic mass: 95.94(1)
Formal oxidation number: +6

Electronegativities: 2.16
Thermal conductivity: 138 W/(m K)
Electrical resistivity (20 °C): 5.34 μΩcm

Atomic radius: 136.3 pm
Density (g/dm3): 10220 (293 K) 
9330 (m.p.)
Molar volume (cm3/mol): 9.39 (293 K) 
10.28 (m.p.)

Melting point: 2623 °C
Boiling point: 4639 °C
Critical temperature: 9177 °C

Heat of fusion: 27.6 kJ/mol
Heat of vaporization: 589.9 kJ/mol
Heat of atomization: 656.55 kJ/mol

Molybdenum is found in the minerals molybdenite (MoS2) and wulfenite (MoO4Pb). Its alloys are used in aircraft, missiles and protective coatings in boiler plate. The price of 99.7 % pure molybdenum pellets is 96.90 € for 500 g. 41Nb <= 42Mo => 43Tc ___________________ If you have comments, corrections or suggestions about this site, please send me a e-mail. Periodic Table of the Elements __________________________________ Last modified: 29.03.2003 Copyright © 1998-2003 by Eni Generalic