Wolfraam

74
W
Groep
6
Periode
6
Blok
d
Protonen
Elektronen
Neutronen
74
74
110
Algemene Eigenschappen
Atoomnummer
74
Atomair gewicht
183,84
Massa Getal
184
Categorie
Overgangsmetalen
Kleur
Grijs
Radioactief
Nee
From Swedish, tung sten meaning heavy stone
Kristalstructuur
Ruimtelijk-gecentreerde Kubus
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.
Eletronen per schil
2, 8, 18, 32, 12, 2
Electronconfiguratie
[Xe] 4f14 5d4 6s2
W
The chemical symbol, W, comes from the original name of the element, Wolfram
Fysieke Eigenschappen
Fase
Vast
Dichtheid
19,25 g/cm3
Smeltpunt
3695,15 K | 3422 °C | 6191,6 °F
Kookpunt
5828,15 K | 5555 °C | 10031 °F
Fusiewarmte
35 kJ/mol
Verdampingswarmte
800 kJ/mol
Specifieke Warmtecapaciteit
0,132 J/g·K
Overvloedig aanwezig in de aardkorst
0,00011%
Overvloedig aanwezig in het universum
5×10-8%
Tungsten
Verdiensten voor afbeeldingen: Images-of-elements
Tungsten rod with oxidized surface
CAS-nummer
7440-33-7
PubChem CID nummer
23964
Atoomeigenschappen
Atoomstraal
139 pm
Covalentiestraal
162 pm
Electronegativiteit
2,36 (Pauling schaal)
Ionisatiepotentiaal
7,864 eV
Atoomvolume
9,53 cm3/mol
Thermische geleiding
1,74 W/cm·K
Oxidatietoestanden
-2, -1, 1, 2, 3, 4, 5, 6
Toepassingen
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
Isotopen
Stabiele isotopen
180W, 182W, 183W, 184W, 186W
Instabiele isotopen
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