Cerij
58
Ce
Skupina
n/p
Perioda
6
Blok
f
Protoni
Elektroni
Nevtroni
58
58
82
Splošne lastnosti
Vrstno število
58
Atomska teža
140,116
Masno število
140
Kategorija
Lantanoidi
Barva
Srebrna
Radioaktivno
Ne
Cerium was named for the asteroid Ceres
Kristalna struktura
Heksagonalna
Zgodovina
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.
Elektroni po lupinah
2, 8, 18, 19, 9, 2
Razporeditev elektronov
[Xe] 4f1 5d1 6s2
Seawater contains 1.5 parts per trillion of cerium
Fizikalne lastnosti
Faza snovi
Trdnina
Gostota
6,77 g/cm3
Tališče
1068,15 K | 795 °C | 1463 °F
Vrelišče
3716,15 K | 3443 °C | 6229,4 °F
Talilna toplota
5,5 kJ/mol
Izparilna toplota
350 kJ/mol
Toplotna kapaciteta
0,192 J/g·K
Zastopanost v Zemljini skorji
0,006%
Zastopanost v vesolju
1×10-6%
CAS številka
7440-45-1
PubChem CID številka
23974
Atomske lastnosti
Atomski polmer
182 pm
Kovalentni polmer
204 pm
Elektronegativnost
1,12 (Paulingova lestvica)
Ionizacijski potencial
5,5387 eV
Atomski volumen
20,67 cm3/mol
Toplotna prevodnost
0,114 W/cm·K
Oksidacijska stanja
2, 3, 4
Uporabe
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