Cerium
58
Ce
Grupp
Ej tillämplig
Period
6
Block
f
Protoner
Elektroner
Neutroner
58
58
82
Generella Egenskaper
Atomnummer
58
Atommassa
140,116
Masstal
140
Kategori
Lantanoider
Färg
Silver
Radioaktiv
Nej
Cerium was named for the asteroid Ceres
Kristallstruktur
Enkelt hexagonalt
Historia
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 skal
2, 8, 18, 19, 9, 2
Elektronkonfiguration
[Xe] 4f1 5d1 6s2
Seawater contains 1.5 parts per trillion of cerium
Fysikaliska Egenskaper
Aggregationstillstånd
Fast
Densitet
6,77 g/cm3
Smältpunkt
1068,15 K | 795 °C | 1463 °F
Kokpunkt
3716,15 K | 3443 °C | 6229,4 °F
Smältvärme
5,5 kJ/mol
Ångbildningsvärme
350 kJ/mol
Specifik värmekapacitet
0,192 J/g·K
Förekomst i jordskorpan
0,006%
Förekomst i universum
1×10-6%
CAS-nummer
7440-45-1
PubChem CID-nummer
23974
Atomära Egenskaper
Atomradie
182 pm
Kovalent radie
204 pm
Elektronegativitet
1,12 (Paulingskalan)
Jonisationspotential
5,5387 eV
Molvolym
20,67 cm3/mol
Värmeledningsförmåga
0,114 W/cm·K
Oxidationstillstånd
2, 3, 4
Användningsområden
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
Stabila isotoper
136Ce, 138Ce, 140Ce, 142CeInstabila 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