特性

CAS Number7440-71-3
PubChem CIDna
原子半径-
モル体積18.4
原子量[251]
ブロックf
沸点-
Bulk Modulus
カテゴリアクチノイド
結晶構造六方最密構造
共有結合半径-
密度15.1
Electrical Resistivity
電子配置[Rn] 5f10 7s2
電子殻2, 8, 18, 32, 28, 8, 2
電気陰性度1.3
Electrons98
na
融解熱na
蒸発熱na
イオン化エネルギー6.282
Magnetic Ordering
Magnetic Susceptibility
質量[251]
Mass Number98
融点900
名称カリホルニウム
中性子153
原子番号251
酸化数2, 3, 4
周期7
固体
Poisson Ratio
陽子98
Shear Modulus
熱容量-
記号Cf
熱伝導率0.1
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
Cf カリホルニウム 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

タリウムの同位体

Standard Atomic Weight

安定同位体

不安定同位体

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.