Volfram
74
W
Skupina
6
Perioda
6
Blok
d
Protoni
Elektroni
Nevtroni
74
74
110
Splošne lastnosti
Vrstno število
74
Atomska teža
183,84
Masno število
184
Kategorija
Prehodne kovine
Barva
Siva
Radioaktivno
Ne
From Swedish, tung sten meaning heavy stone
Kristalna struktura
Telesno centrirana kubična
Zgodovina
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.
Elektroni po lupinah
2, 8, 18, 32, 12, 2
Razporeditev elektronov
[Xe] 4f14 5d4 6s2
The chemical symbol, W, comes from the original name of the element, Wolfram
Fizikalne lastnosti
Faza snovi
Trdnina
Gostota
19,25 g/cm3
Tališče
3695,15 K | 3422 °C | 6191,6 °F
Vrelišče
5828,15 K | 5555 °C | 10031 °F
Talilna toplota
35 kJ/mol
Izparilna toplota
800 kJ/mol
Toplotna kapaciteta
0,132 J/g·K
Zastopanost v Zemljini skorji
0,00011%
Zastopanost v vesolju
5×10-8%
CAS številka
7440-33-7
PubChem CID številka
23964
Atomske lastnosti
Atomski polmer
139 pm
Kovalentni polmer
162 pm
Elektronegativnost
2,36 (Paulingova lestvica)
Ionizacijski potencial
7,864 eV
Atomski volumen
9,53 cm3/mol
Toplotna prevodnost
1,74 W/cm·K
Oksidacijska stanja
-2, -1, 1, 2, 3, 4, 5, 6
Uporabe
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
Izotopi
Stabilni izotopi
180W, 182W, 183W, 184W, 186WNestabilni izotopi
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