Cerij
58
Ce
Skupina
n/a
Perioda
6
Blok
f
Protoni
Elektroni
Neutroni
58
58
82
Opća svojstva
Atomski broj
58
Relativna atomska masa
140,116
Maseni broj
140
Kategorija
Lantanoidi
Boja
Srebrna
Radioaktivan
Ne
Cerij je imenovan po asteroidu Ceresu
Kristalna struktura
Jednostavna heksagonska
Povijest
Jöns Jakob Berzelius and Wilhelm Hisinger discovered the element in ceria in 1803 in Sweden.
Klaproth discovered it simultaneously and independently in some tantalum samples in Germany.
Carl Gustaf Mosander, who worked closely with Berzelius, prepared metallic cerium in 1825.
Klaproth discovered it simultaneously and independently in some tantalum samples in Germany.
Carl Gustaf Mosander, who worked closely with Berzelius, prepared metallic cerium in 1825.
Elektrona po ljusci
2, 8, 18, 19, 9, 2
Elektronska konfiguracija
[Xe] 4f1 5d1 6s2
Seawater contains 1.5 parts per trillion of cerium
Fizikalna svojstva
Agregacijsko stanje
Čvrsto
Gustoća
6,77 g/cm3
Talište
1068,15 K | 795 °C | 1463 °F
Vrelište
3716,15 K | 3443 °C | 6229,4 °F
Toplina taljenja
5,5 kJ/mol
Toplina isparavanja
350 kJ/mol
Specifični toplinski kapacitet
0,192 J/g·K
Zastupljenost u Zemljinoj kori
0,006%
Zastupljenost u svemiru
1×10-6%
CAS broj
7440-45-1
PubChem CID broj
23974
Atomska svojstva
Atomski radijus
182 pm
Kovalentni radijus
204 pm
Elektronegativnost
1,12 (Paulingova ljestvica)
Potencijal ionizacije
5,5387 eV
Atomski volumen
20,67 cm3/mol
Toplinska vodljivost
0,114 W/cm·K
Stanja oksidacije
2, 3, 4
Primjene
Cerium is used in carbon-arc lighting, especially in the motion picture industry.
Cerium oxide is an important component of glass polishing powders and phosphors used in screens and fluorescent lamps.
Cerium compounds are also used in the manufacture of glass, both as a component and as a decolorizer.
Cerium oxide is an important component of glass polishing powders and phosphors used in screens and fluorescent lamps.
Cerium compounds are also used in the manufacture of glass, both as a component and as a decolorizer.
Cerium is considered to be moderately toxic
Izotopi
Stabilni izotopi
136Ce, 138Ce, 140Ce, 142CeNestabilni izotopi
119Ce, 120Ce, 121Ce, 122Ce, 123Ce, 124Ce, 125Ce, 126Ce, 127Ce, 128Ce, 129Ce, 130Ce, 131Ce, 132Ce, 133Ce, 134Ce, 135Ce, 137Ce, 139Ce, 141Ce, 143Ce, 144Ce, 145Ce, 146Ce, 147Ce, 148Ce, 149Ce, 150Ce, 151Ce, 152Ce, 153Ce, 154Ce, 155Ce, 156Ce, 157Ce