Tungsten

74
W
Golongan
6
Periode
6
Blok
d
Proton
Elektron
Neutron
74
74
110
Sifat Umum
Nomor atom
74
Massa atom
183,84
Nomor massa
184
Kategori
Logam transisi
Warna
Abu-abu
Radioaktif
Tidak
From Swedish, tung sten meaning heavy stone
Struktur kristal
Kubik Berpusat-badan
Sejarah
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.
Elektron per kulit
2, 8, 18, 32, 12, 2
Konfigurasi elektron
[Xe] 4f14 5d4 6s2
W
The chemical symbol, W, comes from the original name of the element, Wolfram
Sifat Fisika
Fase
Solid
Kepadatan
19,25 g/cm3
Titik lebur
3695,15 K | 3422 °C | 6191,6 °F
Titik didih
5828,15 K | 5555 °C | 10031 °F
Kalor peleburan
35 kJ/mol
Kalor penguapan
800 kJ/mol
Kapasitas kalor molar
0,132 J/g·K
Kelimpahan di kerak bumi
0,00011%
Kelimpahan di alam semesta
5×10-8%
Tungsten
Kredit Gambar: Images-of-elements
Tungsten rod with oxidized surface
Nomor CAS
7440-33-7
PubChem CID Number
23964
Sifat Atom
Jari-jari atom
139 pm
Jari-jari kovalen
162 pm
Elektronegativitas
2,36 (Skala Pauling)
Potensi Ionisasi
7,864 eV
Volume atom
9,53 cm3/mol
Kondusivitas termal
1,74 W/cm·K
Bilangan oksidasi
-2, -1, 1, 2, 3, 4, 5, 6
Aplikasi
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
Isotop
Isotop stabil
180W, 182W, 183W, 184W, 186W
Isotop tidak stabil
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