Cerium
58
Ce
Gruppe
n/a
Periode
6
Blok
f
Protoner
Elektroner
Neutroner
58
58
82
Generelle Egenskaber
Atomnummer
58
Atommasse
140,116
Masseantal
140
Kategori
Lantanider
Farve
Sølv
Radioaktiv
Nej
Cerium was named for the asteroid Ceres
Krystalstruktur
Simpel 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 i hver skal
2, 8, 18, 19, 9, 2
Elektronkonfiguration
[Xe] 4f1 5d1 6s2
Seawater contains 1.5 parts per trillion of cerium
Fysiske Egenskaber
Tilstandsform
Fast stof
Massefylde
6,77 g/cm3
Smeltepunkt
1068,15 K | 795 °C | 1463 °F
Kogepunkt
3716,15 K | 3443 °C | 6229,4 °F
Smeltevarme
5,5 kJ/mol
Fordampningsvarme
350 kJ/mol
Varmefylde
0,192 J/g·K
Forekomst i jordskorpen
0,006%
Forekomst i universet
1×10-6%
CAS-nummer
7440-45-1
PubChem CID-nummer
23974
Atomare egenskaber
Atomradius
182 pm
Kovalent radius
204 pm
Elektronegativitet
1,12 (Paulings skala)
Ioniseringspotentiale
5,5387 eV
Atomvolumen
20,67 cm3/mol
Varmeledningsevne
0,114 W/cm·K
Oxidationstrin
2, 3, 4
Anvendelser
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