タングステン
74
W
族
6
周期
6
ブロック
d
陽子
電子
中性子
74
74
110
一般特性
原子番号
74
原子量
183.84
質量数
184
カテゴリ
遷移元素
色
灰色
放射性
いいえ
From Swedish, tung sten meaning heavy stone
結晶構造
体心立方格子
歴史
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.
電子殻
2, 8, 18, 32, 12, 2
電子配置
[Xe] 4f14 5d4 6s2
The chemical symbol, W, comes from the original name of the element, Wolfram
物理特性
相
固体
密度
19.25 g/㎝3
融点
3695.15 K | 3422 °C | 6191.6 °F
沸点
5828.15 K | 5555 °C | 10031 °F
融解熱
35 kJ/mol
蒸発熱
800 kJ/mol
熱容量
0.132 J/g·K
地殻中における存在比
0.00011%
宇宙空間における存在比
5×10-8%
CAS登録番号
7440-33-7
PubChem CID番号
23964
原子特性
原子半径
139 pm
共有結合半径
162 pm
電気陰性度
2.36 (ポーリングの値)
イオン化エネルギー
7.864 eV
モル体積
9.53 ㎝3/mol
熱伝導率
1.74 W/㎝·K
酸化数
-2, -1, 1, 2, 3, 4, 5, 6
用途
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
同位体
安定同位体
180W, 182W, 183W, 184W, 186W不安定同位体
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