Volframi
74
W
Ryhmä
6
Jakso
6
Lohko
d
Protonia
Elektronit
Neutronia
74
74
110
Yleiset ominaisuudet
Järjestysluku
74
Atomipaino
183,84
Massaluku
184
Luokka
Siirtymäalkuaineet
Väri
Harmaa
Radioaktiivisuus
Ei
From Swedish, tung sten meaning heavy stone
Kiderakenne
Tilakeskinen kuutiollinen
Historia
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.
Elektroneja elektronikuorilla
2, 8, 18, 32, 12, 2
Orbitaalirakenne
[Xe] 4f14 5d4 6s2
The chemical symbol, W, comes from the original name of the element, Wolfram
Fyysiset ominaisuudet
Olomuoto
Kiinteä
Tiheys
19,25 g/cm3
Sulamispiste
3695,15 K | 3422 °C | 6191,6 °F
Kiehumispiste
5828,15 K | 5555 °C | 10031 °F
Sulamislämpö
35 kJ/mol
Höyrystymislämpö
800 kJ/mol
Ominaislämpökapasiteetti
0,132 J/g·K
Esiintyvyys maankuoressa
0,00011%
Esiintyvyys maailmankaikkeudessa
5×10-8%
CAS-numero
7440-33-7
PubChem CID-numero
23964
Atomiominaisuudet
Atomisäde
139 pm
Kovalenttisäde
162 pm
Elektronegatiivisuus
2,36 (Paulingin asteikko)
Ionisoitumispotentiaali
7,864 eV
Moolitilavuus
9,53 cm3/mol
Lämmönjohtavuus
1,74 W/cm·K
Hapetusluvut
-2, -1, 1, 2, 3, 4, 5, 6
Käyttö
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
Isotooppi
Vakaat isotoopit
180W, 182W, 183W, 184W, 186WEpävakaat isotoopit
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