Lanthanum Praseodymium

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).
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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

Atomära egenskaper

Electronegativity (Pauling Scale)1.12
Electron affinity55 kJ/mol
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

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