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Cerium (Ce)

From Wikipedia, the free encyclopediaCerium is a chemical element with symbol Ce and atomic number 58. It is a soft, silvery, ductile metal which easily oxidizes in air. Cerium was named after the dwarf planet Ceres (itself named after the Roman goddess of agriculture).

Cerium in the periodic table

SymbolCe
Atomic number58
Group0
Period6
Blockf
Element categoryLanthanide

Physical properties

Phase at STPSolid
Density6.77 g/cm3
Atomic weight140.116 u
Melting point1068 K
794.85 °C
1462.73 °F
Boiling point3716 K
3442.85 °C
6229.13 °F

Atomic properties

Electronegativity (Pauling Scale)1.12
Electron affinity55 kJ/mol
Oxidation states+1, +2, +3, +4
(a mildly basic oxide)
Ionization energies
1534.4 kJ/mol
2 1050 kJ/mol
3 1949 kJ/mol
4 3547 kJ/mol
5 6325 kJ/mol
6 7490 kJ/mol

Electron configuration

Elektronkonfiguration (shorthand)[Xe] 4f1 5d1 6s2
Electron configuration1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f1 5s2 5p6 5d1 6s2
Electrons per shell2, 8, 18, 19, 9, 2

History

Discovered1803
Discovered byMartin Heinrich Klaproth
Wilhelm Hisinger
Jöns Jacob Berzelius
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