Eigenschaften

CAS-Nummer7440-71-3
PubChem CIDna
Atomradius-
Molares Volumen18,4
Atommasse[251]
Blockf
Siedepunkt-
Bulk Modulus
KategorieActinoide
KristallstrukturEinfach hexagonal
Farbe
Kovalenter Radius-
Dichte15,1
Electrical Resistivity
Elektronenkonfiguration[Rn] 5f10 7s2
Elektronen pro Schale2, 8, 18, 32, 28, 8, 2
Elektronegativität1,3
Elektronen98
Gruppena
Schmelzwärmena
Verdampfungswärmena
Ionisierungsenergie6,282
Magnetic Ordering
Magnetic Susceptibility
Masse[251]
Massenzahl98
Schmelzpunkt900
NameKalifornium
Neutronen153
Ordnungszahl251
Oxidationszustände2, 3, 4
Periode7
AggregatzustandFest
Poisson Ratio
Protonen98
Shear Modulus
Spezifische Wärmekapazität-
ElementsymbolCf
Wärmeleitfähigkeit0,1
Van der Waals Radius
Young's Modulus
Häufigkeit
Häufigkeit in der Erdkrustena
Häufigkeit im Universumna
Cf Kalifornium 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

Stabile Isotope

Instabile Isotope

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.