Cerium
58
Ce
Gruppe
I/T
Periode
6
Blokk
f
Protoner
Elektroner
Nøytroner
58
58
82
Generelle egenskaper
Atomnummer
58
Atomvekt
140,116
Massetall
140
Kategori
Lantanoider
Farge
Sølv
Radioaktiv
Nei
Cerium was named for the asteroid Ceres
Krystallstruktur
Simple Hexagonal
Historie
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.
Elektroner per energinivå
2, 8, 18, 19, 9, 2
Elektronkonfigurasjon
[Xe] 4f1 5d1 6s2
Seawater contains 1.5 parts per trillion of cerium
Fysikalske egenskaper
Fase
Fast stoff
Tetthet
6,77 g/cm3
Smeltepunkt
1068,15 K | 795 °C | 1463 °F
Kokepunkt
3716,15 K | 3443 °C | 6229,4 °F
Smeltevarme
5,5 kJ/mol
Fordampningsvarme
350 kJ/mol
Spesifikk varmekapasitet
0,192 J/g·K
Forekomst i jordskorpa
0,006%
Forekomst i universet
1×10-6%
CAS Number
7440-45-1
PubChem CID Number
23974
Atomegenskaper
Atomradius
182 pm
Kovalent radius
204 pm
Elektronegativitet
1,12 (Pauling-skalaen)
Ioniseringsenergi
5,5387 eV
Molart volum
20,67 cm3/mol
Termisk ledningsevne
0,114 W/cm·K
Oksidasjonstilstander
2, 3, 4
Bruksområder
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
Isotoper
Stabile isotoper
136Ce, 138Ce, 140Ce, 142CeUstabile isotoper
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