タンタル
73
Ta
族
5
周期
6
ブロック
d
陽子
電子
中性子
73
73
108
一般特性
原子番号
73
原子量
180.94788
質量数
181
カテゴリ
遷移元素
色
灰色
放射性
いいえ
Named after Tantalos, a Greek mythological character, father of Niobe
結晶構造
体心立方格子
歴史
Tantalum was discovered in Sweden in 1802 by Anders Ekeberg in the minerals tantalite from Finland and yttrotantalite from Sweden.
Unfortunately, William Hyde Wollaston claimed Ekeberg's new element was actually niobium, which had also been discovered in 1802.
In 1846, German chemist Heinrich Rose finally proved beyond doubt that tantalum and niobium were different elements.
Unfortunately, William Hyde Wollaston claimed Ekeberg's new element was actually niobium, which had also been discovered in 1802.
In 1846, German chemist Heinrich Rose finally proved beyond doubt that tantalum and niobium were different elements.
電子殻
2, 8, 18, 32, 11, 2
電子配置
[Xe] 4f14 5d3 6s2
Tantalum occurs principally in the mineral columbite-tantalite
物理特性
相
固体
密度
16.654 g/㎝3
融点
3290.15 K | 3017 °C | 5462.6 °F
沸点
5731.15 K | 5458 °C | 9856.4 °F
融解熱
36 kJ/mol
蒸発熱
735 kJ/mol
熱容量
0.14 J/g·K
地殻中における存在比
0.00017%
宇宙空間における存在比
8×10-9%
CAS登録番号
7440-25-7
PubChem CID番号
23956
原子特性
原子半径
146 pm
共有結合半径
170 pm
電気陰性度
1.5 (ポーリングの値)
イオン化エネルギー
7.5496 eV
モル体積
10.90 ㎝3/mol
熱伝導率
0.575 W/㎝·K
酸化数
-1, 2, 3, 4, 5
用途
Tantalum is used in the electronics industry for capacitors and high power resistors.
The high melting point and oxidation resistance lead to the use of the metal in the production of vacuum furnace parts.
Tantalum oxide is used to make special glass with high index of refraction for camera lenses.
The high melting point and oxidation resistance lead to the use of the metal in the production of vacuum furnace parts.
Tantalum oxide is used to make special glass with high index of refraction for camera lenses.
Tantalum is considered to be non-toxic
同位体
安定同位体
181Ta不安定同位体
155Ta, 156Ta, 157Ta, 158Ta, 159Ta, 160Ta, 161Ta, 162Ta, 163Ta, 164Ta, 165Ta, 166Ta, 167Ta, 168Ta, 169Ta, 170Ta, 171Ta, 172Ta, 173Ta, 174Ta, 175Ta, 176Ta, 177Ta, 178Ta, 179Ta, 180Ta, 182Ta, 183Ta, 184Ta, 185Ta, 186Ta, 187Ta, 188Ta, 189Ta, 190Ta