Cerium

58
Ce
Groep
n.v.t.
Periode
6
Blok
f
Protonen
Elektronen
Neutronen
58
58
82
Algemene Eigenschappen
Atoomnummer
58
Atomair gewicht
140,116
Massa Getal
140
Categorie
Lanthaniden
Kleur
Zilver
Radioactief
Nee
Cerium was named for the asteroid Ceres
Kristalstructuur
Eenvoudige Hexagonaal
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.
Eletronen per schil
2, 8, 18, 19, 9, 2
Electronconfiguratie
[Xe] 4f1 5d1 6s2
Ce
Seawater contains 1.5 parts per trillion of cerium
Fysieke Eigenschappen
Fase
Vast
Dichtheid
6,77 g/cm3
Smeltpunt
1068,15 K | 795 °C | 1463 °F
Kookpunt
3716,15 K | 3443 °C | 6229,4 °F
Fusiewarmte
5,5 kJ/mol
Verdampingswarmte
350 kJ/mol
Specifieke Warmtecapaciteit
0,192 J/g·K
Overvloedig aanwezig in de aardkorst
0,006%
Overvloedig aanwezig in het universum
1×10-6%
Ultrapure
Verdiensten voor afbeeldingen: Images-of-elements
Ultrapure cerium under argon
CAS-nummer
7440-45-1
PubChem CID nummer
23974
Atoomeigenschappen
Atoomstraal
182 pm
Covalentiestraal
204 pm
Electronegativiteit
1,12 (Pauling schaal)
Ionisatiepotentiaal
5,5387 eV
Atoomvolume
20,67 cm3/mol
Thermische geleiding
0,114 W/cm·K
Oxidatietoestanden
2, 3, 4
Toepassingen
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 is considered to be moderately toxic
Isotopen
Stabiele isotopen
136Ce, 138Ce, 140Ce, 142Ce
Instabiele isotopen
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