Cerium
58
Ce
Ryhmä
Ei saatavilla
Jakso
6
Lohko
f
Protonia
Elektronit
Neutronia
58
58
82
Yleiset ominaisuudet
Järjestysluku
58
Atomipaino
140,116
Massaluku
140
Luokka
Lantanoidit
Väri
Hopea
Radioaktiivisuus
Ei
Cerium was named for the asteroid Ceres
Kiderakenne
Yksinkertainen kuusikulmainen
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.
Elektroneja elektronikuorilla
2, 8, 18, 19, 9, 2
Orbitaalirakenne
[Xe] 4f1 5d1 6s2
Seawater contains 1.5 parts per trillion of cerium
Fyysiset ominaisuudet
Olomuoto
Kiinteä
Tiheys
6,77 g/cm3
Sulamispiste
1068,15 K | 795 °C | 1463 °F
Kiehumispiste
3716,15 K | 3443 °C | 6229,4 °F
Sulamislämpö
5,5 kJ/mol
Höyrystymislämpö
350 kJ/mol
Ominaislämpökapasiteetti
0,192 J/g·K
Esiintyvyys maankuoressa
0,006%
Esiintyvyys maailmankaikkeudessa
1×10-6%
CAS-numero
7440-45-1
PubChem CID-numero
23974
Atomiominaisuudet
Atomisäde
182 pm
Kovalenttisäde
204 pm
Elektronegatiivisuus
1,12 (Paulingin asteikko)
Ionisoitumispotentiaali
5,5387 eV
Moolitilavuus
20,67 cm3/mol
Lämmönjohtavuus
0,114 W/cm·K
Hapetusluvut
2, 3, 4
Käyttö
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
Isotooppi
Vakaat isotoopit
136Ce, 138Ce, 140Ce, 142CeEpävakaat isotoopit
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