Periodic table

 

 

Atomic number:42

Group numbers:6

Period:5

Electronic configuration:[Kr] 4d⁵ 5s¹

Formal oxidation number:+6

Electronegativities:2.16

Atomic radius / pm:136.3

Relative atomic mass:95.96 ± 0.02

 

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.

PHYSICAL PROPERTIES

Density / g dm^-3:10220 (293 K)

 9330 (m.p.)

Molar volume / cm³mol^-1:9.39 (293 K)

 10.28 (m.p.)

Electrical resistivity / μΩcm:5.34 (20 °C)

THERMAL PROPERTIES

Thermal conductivity / W m^-1K^-1:138

Melting point / °C:2623

Boiling point / °C:4639

Heat of fusion / kJ mol^-1:27.6

Heat of vaporization / kJ mol^-1:589.9

Heat of atomization / kJ mol^-1:656.55

IONIZATION ENERGIES

First ionization energy / kJ mol^-1:684.32

Second ionization energy / kJ mol^-1:1559.21

Third ionization energy / kJ mol^-1:2617.67

ABUNDANCE OF ELEMENTS

in the atmosphere / ppm:-

in the Earth's crust / ppm:1

in the oceans / ppm:0.01

CRYSTALLOGRAPHIC DATA

ISOTOPES

REDUCTION POTENTIALS

 

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Citing this page:

Generalic, Eni. "Molybdenum." EniG. Periodic Table of the Elements. 16 May 2013. KTF-Split. {Date of access}. <http://www.periodni.com/mo.html>.