Relative atomic mass: 95.94 +- 0.02

English: Molybdenum
French: Molybdene
Croatian: Molibden
German: Molybdan
Italian: Molibdeno
Spanish: Molibdeno

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

Discovery: 1778 Carl Wilhelm Scheele (SE)
Molybdenum was discovered by Carl William Scheele (SE) in 1778. The origin of the name comes from the Greek word molybdos meaning lead. It is a silvery white, very hard metal, but is softer and more ductile than tungsten. 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.
Electronic configuration: [Kr] 4d5 5s1
Formal oxidation number: +6
Atomic radius: 136.3 pm

Electronegativities: 2.16
Thermal conductivity: 138 W/(m K)
Electrical resistivity (20 oC): 5.34 microOhm cm

Melting point: 2623 oC
Boiling point: 4639 oC

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

41Nb <= 42Mo => 43Tc

ASCII Periodic Table of the Elements
6 Jan. 2020
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