Wolfram
74
W
Gruppe
6
Periode
6
Blokk
d
Protons
Electrons
Neutrons
74
74
110
Generelle eigenskapar
Atomnummer
74
Atommasse
183,84
Mass Number
184
Kategori
Transisjonsmetall
Farge
Grå
Radioactive
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.
Elektron 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
Fysiske eigenskapar
Tilstandsform
Fast stoff
Tettleik
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
Fordampingsvarme
800 kJ/mol
Spesifikk varmekapasitet
0,132 J/g·K
Abundance in Earth's crust
0,00011%
Abundance in Universe
5×10-8%
CAS Number
7440-33-7
PubChem CID Number
23964
Atom eigenskapar
Atomradius
139 pm
Kovalent radius
162 pm
Elektronegativitet
2,36 (Paulings skala)
Ioniseringspotensial
7,864 eV
Molart volum
9,53 cm3/mol
Termisk konduktivitet
1,74 W/cm·K
Oksidasjonstrinn
-2, -1, 1, 2, 3, 4, 5, 6
Applications
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
Isotopes
Stable Isotopes
180W, 182W, 183W, 184W, 186WUnstable Isotopes
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