Tungsten - Periodic Table of the Elements

FACULTY OF CHEMICAL TECHNOLOGY IN SPLIT
PERIODIC TABLE OF THE ELEMENTS version 1.7


 W

English:  Tungsten
French: Tungstène
Croatian: Volfram
German: Wolfram
Italian: Wolframio


Atomic number: 74
Group numbers: 6
Period: 6
Standard state (20 °C): solid

Tungsten was discovered by Fausto and Juan Jose de Elhuyar (Spain) in 1783. Named after the tungsten mineral wolframite. It is hard, steel-grey to white metal. Highest melting point of all metals. Resists oxygen, acids and alkalis.

Electronic configuration: [Xe] 4f¹⁴ 5d⁴ 6s²
Relative atomic mass: 183.84(1)
Formal oxidation number: +6

Electronegativities: 1.7
Thermal conductivity: 174 W/(m K)
Electrical resistivity (20 °C): 5.4 μΩcm

Atomic radius: 137 pm
Density (g/dm3): 19300 (293 K) 
17700 (m.p.)
Molar volume (cm3/mol): 9.53 (293 K) 
10.39 (m.p.)

Melting point: 3422 °C
Boiling point: 5555 °C
Critical temperature: 11727 °C

Heat of fusion: 35.2 kJ/mol
Heat of vaporization: 824.2 kJ/mol
Heat of atomization: 848.1 kJ/mol

Tungsten occurs in the minerals scheelite (CaWO4) and wolframite [(Fe,Mn)WO4]. Made into filaments for vacuum tubes and electric lights. Also as contact points in cars. Tungsten carbide is extremely hard and is used for making cutting tools and abrasives. The price of 99.95 % pure tungsten powder is 193.60 € for 250 g. 73Ta <= 74W => 75Re ___________________ 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