Volfram

74
W
Skupina
6
Perioda
6
Blok
d
Protons
Electrons
Neutrons
74
74
110
General Properties
Vrstno število
74
Atomska teža
183,84
Mass Number
184
Kategorija
Prehodne kovine
Barva
Gray
Radioactive
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.
Electrons per shell
2, 8, 18, 32, 12, 2
Razporeditev elektronov
[Xe] 4f14 5d4 6s2
W
The chemical symbol, W, comes from the original name of the element, Wolfram
Physical Properties
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
Abundance in Earth's crust
0,00011%
Abundance in Universe
5×10-8%
Tungsten
Zasluge za slike: Images-of-elements
Tungsten rod with oxidized surface
CAS Number
7440-33-7
PubChem CID Number
23964
Atomic Properties
Atomski polmer
139 pm
Kovalentni polmer
162 pm
Elektronegativnost
2,36 (Paulingova lestvica)
Ionization Potential
7,864 eV
Atomic Volume
9,53 cm3/mol
Toplotna prevodnost
1,74 W/cm·K
Oksidacijska stanja
-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
Isotopes
Stable Isotopes
180W, 182W, 183W, 184W, 186W
Unstable 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