Propriedades

CAS Number7440-34-8
PubChem CIDna
Raio atómico-
Volume atômico22,54
Massa atômica[227]
Blocof
Ponto de ebulição3.198
Bulk Modulus
CategoriaActinóides
Estrutura cristalinaCúbico de faces centradas
CorPrata
Raio covalente215
Densidade10,07
Electrical Resistivity
Configuração eletrônica[Rn] 6d1 7s2
Elétrons por nível2, 8, 18, 32, 18, 9, 2
Eletronegatividade1,1
Electrons89
Grupona
Entalpia de fusão14
Entalpia de vaporização400
Potencial de ionização5,17
Magnetic Ordering
Magnetic Susceptibility
Massa[227]
Mass Number89
Ponto de fusão1.050
NomeActínio
Nêutrons138
Número atómico227
Estados de oxidação3
Período7
Estado da matériaSólido
Poisson Ratio
Prótons89
Shear Modulus
Calor específico0,12
SímboloAc
Condutividade térmica0,12
Van der Waals radius
Young's Modulus
Abundância
Abundância na Crosta Terrestrena
Abundância no Universona
Ac Actínio 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. Chamado de Tantalos, um personagem mitológico Grego, pai do Níobe 89 1899 Andre Debierne France From the Greek word "aktinos" meaning "ray"

Isotopes of Tantalum

Standard Atomic Weight

[227]

Isótopos Estáveis

Isótopos Instáveis

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.