Volfram

74
W
Grupp
6
Period
6
Block
d
Protoner
Electrons
Neutroner
74
74
110
Generella Egenskaper
Atomnummer
74
Atommassa
183,84
Mass Number
184
Kategori
Övergångsmetaller
Färg
Grå
Radioaktiv
Nej
From Swedish, tung sten meaning heavy stone
Kristallstruktur
Rymdcentrerat kubisk
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.
Elektroner per skal
2, 8, 18, 32, 12, 2
Elektronkonfiguration
[Xe] 4f14 5d4 6s2
W
The chemical symbol, W, comes from the original name of the element, Wolfram
Fysikaliska Egenskaper
Aggregationstillstånd
Fast
Densitet
19,25 g/cm3
Smältpunkt
3695,15 K | 3422 °C | 6191,6 °F
Kokpunkt
5828,15 K | 5555 °C | 10031 °F
Smältvärme
35 kJ/mol
Ångbildningsvärme
800 kJ/mol
Specifik värmekapacitet
0,132 J/g·K
Abundance in Earth's crust
0,00011%
Abundance in Universe
5×10-8%
Tungsten
Bildkrediter: Images-of-elements
Tungsten rod with oxidized surface
CAS Number
7440-33-7
PubChem CID Number
23964
Atomära Egenskaper
Atomradie
139 pm
Kovalent radie
162 pm
Elektronegativitet
2,36 (Paulingskalan)
Jonisationspotential
7,864 eV
Molvolym
9,53 cm3/mol
Värmeledningsförmåga
1,74 W/cm·K
Oxidationstillstånd
-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 is considered to be of low toxicity
Isotoper
Stabila isotoper
180W, 182W, 183W, 184W, 186W
Instabila 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