Eigenschappen

CAS Number7440-71-3
PubChem CIDna
Atoomstraal-
Atoomvolume18,4
Atomair gewicht[251]
Blokf
Kookpunt-
Bulk Modulus
CategorieActiniden
KristalstructuurEenvoudige Hexagonaal
Kleur
Covalentiestraal-
Dichtheid15,1
Electrical Resistivity
Electronconfiguratie[Rn] 5f10 7s2
Eletronen per schil2, 8, 18, 32, 28, 8, 2
Electronegativiteit1,3
Electrons98
Groepna
Fusiewarmtena
Verdampingswarmtena
Ionisatiepotentiaal6,282
Magnetic Ordering
Magnetic Susceptibility
Massa[251]
Mass Number98
Smeltpunt900
NaamCalifornium
Neutronen153
Atoomnummer251
Oxidatietoestanden2, 3, 4
Periode7
FaseVast
Poisson Ratio
Protonen98
Shear Modulus
Specifieke Warmtecapaciteit-
SymboolCf
Thermische geleiding0,1
Van der Waals radius
Young's Modulus
Overmaat
Overvloedig aanwezig in de aardkorstna
Overvloedig aanwezig in het universumna
Cf Californium 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

Isotopen van thallium

Standard Atomic Weight

Stabiele isotopen

Instabiele isotopen

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.