Wolfram
74
W
Gruppe
6
Periode
6
Blokk
d
Protoner
Elektroner
Nøytroner
74
74
110
Generelle egenskaper
Atomnummer
74
Atomvekt
183,84
Massetall
184
Kategori
Transisjonsmetaller
Farge
Grå
Radioaktiv
Nei
From Swedish, tung sten meaning heavy stone
Krystallstruktur
Body Centered Cubic
Historie
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.
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.
Elektroner per energinivå
2, 8, 18, 32, 12, 2
Elektronkonfigurasjon
[Xe] 4f14 5d4 6s2
The chemical symbol, W, comes from the original name of the element, Wolfram
Fysikalske egenskaper
Fase
Fast stoff
Tetthet
19,25 g/cm3
Smeltepunkt
3695,15 K | 3422 °C | 6191,6 °F
Kokepunkt
5828,15 K | 5555 °C | 10031 °F
Smeltevarme
35 kJ/mol
Fordampningsvarme
800 kJ/mol
Spesifikk varmekapasitet
0,132 J/g·K
Forekomst i jordskorpa
0,00011%
Forekomst i universet
5×10-8%
CAS Number
7440-33-7
PubChem CID Number
23964
Atomegenskaper
Atomradius
139 pm
Kovalent radius
162 pm
Elektronegativitet
2,36 (Pauling-skalaen)
Ioniseringsenergi
7,864 eV
Molart volum
9,53 cm3/mol
Termisk ledningsevne
1,74 W/cm·K
Oksidasjonstilstander
-2, -1, 1, 2, 3, 4, 5, 6
Bruksområder
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 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
Isotoper
Stabile isotoper
180W, 182W, 183W, 184W, 186WUstabile isotoper
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