Cer
58
Ce
Gruppe
n/a
Periode
6
Block
f
Protonen
Elektronen
Neutronen
58
58
82
Generelle Eigenschaften
Ordnungszahl
58
Atommasse
140,116
Massenzahl
140
Kategorie
Lanthanoide
Farbe
Silber
Radioaktiv
Nein
Cerium wurde nach dem Asteroiden Ceres benannt
Kristallstruktur
Einfach hexagonal
Geschichte
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.
Elektronen pro Schale
2, 8, 18, 19, 9, 2
Elektronenkonfiguration
[Xe] 4f1 5d1 6s2
Seawater contains 1.5 parts per trillion of cerium
Physikalische Eigenschaften
Aggregatzustand
Fest
Dichte
6,77 g/cm3
Schmelzpunkt
1068,15 K | 795 °C | 1463 °F
Siedepunkt
3716,15 K | 3443 °C | 6229,4 °F
Schmelzwärme
5,5 kJ/mol
Verdampfungswärme
350 kJ/mol
Spezifische Wärmekapazität
0,192 J/g·K
Häufigkeit in der Erdkruste
0,006%
Häufigkeit im Universum
1×10-6%
CAS-Nummer
7440-45-1
PubChem CID-Nummer
23974
Atomeigenschaften
Atomradius
182 pm
Kovalenter Radius
204 pm
Elektronegativität
1,12 (Pauling-Skala)
Ionisierungsenergie
5,5387 eV
Molares Volumen
20,67 cm3/mol
Wärmeleitfähigkeit
0,114 W/cm·K
Oxidationszustände
2, 3, 4
Anwendung
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
Isotope
Stabile Isotope
136Ce, 138Ce, 140Ce, 142CeInstabile Isotope
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