Atomic number:74

Group numbers:6

Period:6

Electronic configuration:[Xe] 4f¹⁴ 5d⁴ 6s²

Formal oxidation number:+6

Electronegativities:1.7

Atomic radius / pm:137

Relative atomic mass:183.84 ± 0.01

 

Tungsten was discovered by Fausto and Juan Jose de Elhuyar (ES) in 1783. Named after the tungsten mineral wolframite. It is a hard, steel-grey to white metal that has the highest melting point of all metals. Tungesten resists oxygen, acids and alkalis. Tungsten occurs in the minerals scheelite (CaWO4) and wolframite [(Fe,Mn)WO4]. It is made into filaments for vacuum tubes and electric lights it can also be used as contact points in cars. Tungsten carbide is extremely hard and is used for making cutting tools and abrasives.

Density / g dm^-3:19300 (293 K)

 17700 (m.p.)

Molar volume / cm³mol^-1:9.53 (293 K)

 10.39 (m.p.)

Electrical resistivity / μΩcm:5.4 (20 °C)

Thermal conductivity / W m^-1K^-1:174

Melting point / °C:3422

Boiling point / °C:5555

Heat of fusion / kJ mol^-1:35.2

Heat of vaporization / kJ mol^-1:824.2

Heat of atomization / kJ mol^-1:848.1

1st ionization energy / kJ mol^-1:758.77

2nd ionization energy / kJ mol^-1:-

3rd ionization energy / kJ mol^-1:-

in the atmosphere / ppm:-

in the Earth's crust / ppm:1

in the oceans / ppm:0.000001