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CAS Number7440-71-3
PubChem CIDna
Атомен радиус-
Моларен обем18,4
Атомна маса[251]
Блокf
Температура на кипене-
Bulk Modulus
КатегорияАктиниди
Кристална структураОбикновен шестоъгълник
Цвят
Ковалентен радиус-
Плътност15,1
Electrical Resistivity
Електронна конфигурация[Rn] 5f10 7s2
Електрон на обвивка2, 8, 18, 32, 28, 8, 2
Електроотрицателност1,3
Electrons98
Групаna
Топлина на сливанетоna
Топлина на изпаряванеna
Йонизационен потенциал6,282
Magnetic Ordering
Magnetic Susceptibility
Маса[251]
Mass Number98
Температура на топене900
ИмеКалифорний
Неутрони153
Атомен номер251
Оксидационни държави2, 3, 4
Период7
ФазаТвърди
Poisson Ratio
Протони98
Shear Modulus
Специфичен топлинен капацитет-
СимволCf
Топлопроводимост0,1
Van der Waals radius
Young's Modulus
Изобилие
Изобилие в земната кораna
Изобилие в вселенатаna
Cf Калифорний 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

Стабилни изотопи

Нестабилни изотопи

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.