特性

CAS Number7440-34-8
PubChem CIDna
原子半径-
モル体積22.54
原子量[227]
ブロックf
沸点3,198
Bulk Modulus
カテゴリアクチノイド
結晶構造面心立方格子
銀色
共有結合半径215
密度10.07
Electrical Resistivity
電子配置[Rn] 6d1 7s2
電子殻2, 8, 18, 32, 18, 9, 2
電気陰性度1.1
Electrons89
na
融解熱14
蒸発熱400
イオン化エネルギー5.17
Magnetic Ordering
Magnetic Susceptibility
質量[227]
Mass Number89
融点1,050
名称アクチニウム
中性子138
原子番号227
酸化数3
周期7
固体
Poisson Ratio
陽子89
Shear Modulus
熱容量0.12
記号Ac
熱伝導率0.12
Van der Waals radius
Young's Modulus
天然存在比
地殻中における存在比na
宇宙空間における存在比na
Ac アクチニウム 89 (227) 3 7 f 89 1050.0 3200.0 [Rn] 6d1 7s2 2 8 18 32 18 9 2 10.1 N/A Silver Cubic: Face centered 1.1 {"1":"499","2":"1170"} 499 3 1.88 22.5 0.12 12.0 1 21.7865 y 31.4311y BetaDecay Solid, Actinide, Radioactive, Natural ak-TIN-i-em Heavy, silvery-white, very radioactive metal It has no significant commercial applications. Extremely rare, found in all uranium ores. Usually obtained by treating radium with neutrons in a reactor. 0BlpjWBYW0k Actinium
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. Named after Tantalos, a Greek mythological character, father of Niobe 89 1899 Andre Debierne France From the Greek word "aktinos" meaning "ray"

タンタルの同位体

Standard Atomic Weight

[227]

安定同位体

不安定同位体

206Ac 207Ac 208Ac 209Ac 210Ac 211Ac 212Ac 213Ac 214Ac 215Ac 216Ac 217Ac 218Ac 219Ac 220Ac 221Ac 222Ac 223Ac 224Ac 225Ac 226Ac 227Ac 228Ac 229Ac 230Ac 231Ac 232Ac 233Ac 234Ac 235Ac 236Ac

Tantalum is considered to be non-toxic
Tantalum occurs principally in the mineral columbite-tantalite
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.