Propriedades

CAS Number7440-71-3
PubChem CIDna
Raio atómico-
Volume atômico18,4
Massa atômica[251]
Blocof
Ponto de ebulição-
Bulk Modulus
CategoriaActinóides
Estrutura cristalinaHexagonal simples
Cor
Raio covalente-
Densidade15,1
Electrical Resistivity
Configuração eletrônica[Rn] 5f10 7s2
Elétrons por nível2, 8, 18, 32, 28, 8, 2
Eletronegatividade1,3
Electrons98
Grupona
Entalpia de fusãona
Entalpia de vaporizaçãona
Potencial de ionização6,282
Magnetic Ordering
Magnetic Susceptibility
Massa[251]
Mass Number98
Ponto de fusão900
NomeCalifórnio
Nêutrons153
Número atómico251
Estados de oxidação2, 3, 4
Período7
Estado da matériaSólido
Poisson Ratio
Prótons98
Shear Modulus
Calor específico-
SímboloCf
Condutividade térmica0,1
Van der Waals radius
Young's Modulus
Abundância
Abundância na Crosta Terrestrena
Abundância no Universona
Cf Califórnio 98 (251) 7 f 98 [Rn] 5f10 7s2 2 8 18 32 28 8 2 None Unknown 1.3 {"1":"608"} 608 3 10.0 1 900.6 y 1.3×103y AlphaEmission Solid, Actinide, Radioactive, Synthetic kal-eh-FOR-ni-em Synthetic radioactive metal. Powerful neutron emitter. It has no significant commercial applications. Made by bombarding curium with helium ions. eG6HyPrTccI Californium
Thallium was discovered spectroscopically by Sir William Crookes in 1861, in London.

In 1862, Claude-Auguste Lamy used a spectrometer to determine the composition of a selenium-containing substance which was deposited during the production of sulfuric acid from pyrite.

He noticed the new green line in the spectra and concluded that a new element was present. From Greek thallos, meanin a green shoot or twig 98 1950 Glenn T. Seaborg, Stanley G. Thompson, Albert Ghiorso, Kenneth Street USA Named after the State and University of "California", USA

Isotopes of Thallium

Standard Atomic Weight

Isótopos Estáveis

Isótopos Instáveis

237Cf 238Cf 239Cf 240Cf 241Cf 242Cf 243Cf 244Cf 245Cf 246Cf 247Cf 248Cf 249Cf 250Cf 251Cf 252Cf 253Cf 254Cf 255Cf 256Cf

Thallium and its compounds are highly toxic
Agatha Christie made use of thallium's toxicity in her novel The Pale Horse
Thallium selenide has been used in a bolometer for infrared detection.

Thallium is also used in gamma radiation detection equipment.

Thallium oxide has been used to produce glasses with a high index of refraction, and is used in the manufacture of photo cells.

Some of the electrodes in dissolved oxygen analyzers contain thallium.