Cerium

58
Ce
Gruppe
n/a
Periode
6
Blok
f
Protons
Electrons
Neutrons
58
58
82
General Properties
Atomnummer
58
Atommasse
140,116
Mass Number
140
Kategori
Lantanider
Farve
Silver
Radioactive
Nej
Cerium was named for the asteroid Ceres
Krystalstruktur
Simpel Hexagonal
History
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.
Elektroner i hver skal
2, 8, 18, 19, 9, 2
Elektronkonfiguration
[Xe] 4f1 5d1 6s2
Ce
Seawater contains 1.5 parts per trillion of cerium
Physical Properties
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
Abundance in Earth's crust
0,006%
Abundance in Universe
1×10-6%
Ultrapure
Billede akkrediteringer: Images-of-elements
Ultrapure cerium under argon
CAS Number
7440-45-1
PubChem CID Number
23974
Atomic Properties
Atomradius
182 pm
Kovalent radius
204 pm
Elektronegativitet
1,12 (Paulings skala)
Ionization Potential
5,5387 eV
Atomic Volume
20,67 cm3/mol
Varmeledningsevne
0,114 W/cm·K
Oxidationstrin
2, 3, 4
Applications
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
Isotoper
Stable Isotopes
136Ce, 138Ce, 140Ce, 142Ce
Unstable Isotopes
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