Wolfram

74
W
Groep
6
Periode
6
Blok
d
Protrone
Elektrone
Neutrone
74
74
110
Algemene Eienskappe
Atoom Nommer
74
Atoommassa
183,84
Massa Nommer
184
Kategorie
Oorgangsmetale
Kleur
Grys
Radioaktief
Nee
From Swedish, tung sten meaning heavy stone
Kristalstruktuur
Ligaamsgesentreerde kubieke
Geskiendenis
Torbern Bergman obtained from scheelite an oxide of a new element in 1781.

In 1783, José and Fausto Elhuyar found an acid made from wolframite that was identical to tungstic acid.

Later that year, in Spain, the brothers succeeded in isolating tungsten by reduction of this acid with charcoal, and they are credited with the discovery of the element.
Elektrone per skil
2, 8, 18, 32, 12, 2
Elektronkonfigurasie
[Xe] 4f14 5d4 6s2
W
The chemical symbol, W, comes from the original name of the element, Wolfram
Fisiese Eienskappe
Fase
Soliede
Digtheid
19,25 g/cm3
Smeltpunt
3695,15 K | 3422 °C | 6191,6 °F
Kookpunt
5828,15 K | 5555 °C | 10031 °F
Heat of Fusion
35 kJ/mol
Heat of Vaporization
800 kJ/mol
Spesifieke Hitte Kapasiteit
0,132 J/g·K
Oorvloed in die aardkors
0,00011%
Oorvloed in die heelal
5×10-8%
Tungsten
Beeld Krediete: Images-of-elements
Tungsten rod with oxidized surface
CAS Nommer
7440-33-7
PubChem CID Nommer
23964
Atomiese Eienskappe
Atoom radius
139 pm
Kovalente Radius
162 pm
Elektronegatiewiteit
2,36 (Pauling scale)
Ionisasie potensiaal
7,864 eV
Atoom volume
9,53 cm3/mol
Termiese geleidingsvermoë
1,74 W/cm·K
Oksidasiestate
-2, -1, 1, 2, 3, 4, 5, 6
Toepassings
Tungsten and its alloys are widely used for filaments in electric bulbs and electronic tubes.

Tungsten carbide is of great importance to the metal-working, mining, and petroleum industries.

Tungsten oxides are used in ceramic glazes and calcium/magnesium tungstates are used widely in fluorescent lighting.
Tungsten is considered to be of low toxicity
Isotope
Stabiele Isotope
180W, 182W, 183W, 184W, 186W
Onstabiele Isotope
158W, 159W, 160W, 161W, 162W, 163W, 164W, 165W, 166W, 167W, 168W, 169W, 170W, 171W, 172W, 173W, 174W, 175W, 176W, 177W, 178W, 179W, 181W, 185W, 187W, 188W, 189W, 190W, 191W, 192W