Proprietà

CAS Number7440-71-3
PubChem CIDna
Raggio Atomico-
Volume Molare18,4
Massa Atomica[251]
Bloccof
Punto di Ebollizione-
Bulk Modulus
CategoriaAttinidi
Struttura CristallinaEsagonale Semplice
Colore
Raggio Covalente-
Densità15,1
Electrical Resistivity
Configurazione Elettronica[Rn] 5f10 7s2
Elettroni per shell2, 8, 18, 32, 28, 8, 2
Elettronegatività1,3
Electrons98
Gruppona
Calore di Fusionena
Calore di Evaporazionena
Potenziale di Ionizzazione6,282
Magnetic Ordering
Magnetic Susceptibility
Massa[251]
Mass Number98
Punto di Fusione900
NomeCalifornio
Neutroni153
Numero Atomico251
Stato di Ossidazione2, 3, 4
Periodo7
FaseSolido
Poisson Ratio
Protoni98
Shear Modulus
Capacità Termica Specifica-
SimboloCf
Conduttività Termica0,1
Van der Waals radius
Young's Modulus
Abbondanza
Abbondanza sulla crosta terrestrena
Abbondanza nell'universona
Cf Californio 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. Il nome deriva dal greco thallos, giovane germoglio 98 1950 Glenn T. Seaborg, Stanley G. Thompson, Albert Ghiorso, Kenneth Street USA Named after the State and University of "California", USA

Isotopi del tallio

Standard Atomic Weight

Isotopi Stabili

Isotopi Instabili

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.