鉭
73
Ta
族
5
週期
6
區
d
個質子
電子
個中子
73
73
108
一般屬性
原子序數
73
標準原子質量
180.94788
品質編號
181
類別
過渡金屬
顏色
灰色
放射性
否
希臘神話中的尼俄百的父親，坦塔羅斯
晶體結構
體心立方
歷史
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.
每個外殼的電子
2, 8, 18, 32, 11, 2
電子排布
[Xe] 4f14 5d3 6s2
Tantalum occurs principally in the mineral columbite-tantalite
物理性質
物態
固體
密度
16.654 g/cm3
熔點
3290.15 K | 3017 °C | 5462.6 °F
沸點
5731.15 K | 5458 °C | 9856.4 °F
熔化熱
36 kJ/mol
汽化熱
735 kJ/mol
比熱容
0.14 J/g·K
地殼豐度
0.00017%
宇宙豐度
8×10-9%
CAS 編號
7440-25-7
Pubchem CID 編號
23956
原子性質
原子半徑
146 pm
共價半徑
170 pm
電負性
1.5 (鲍林标度)
電離電位
7.5496 eV
原子體積
10.90 cm3/mol
熱導率
0.575 W/cm·K
氧化態
-1, 2, 3, 4, 5
應用
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
同位素
穩定同位素
181Ta不穩定同位素
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