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Metal > CeriumCe - Cerium This rare earth element was named after the planetoid Ceres which was found the year before cerium was discovered, 1803, by Berzelius and Hisinger. Pure cerium was produced in 1875 by Hillebrand and Norton. In out laboratory, cerium compounds may be observed with the emission spectrometer. Atomic number - 58 Density g/mL 6 .78 Atomic weight u 140 .12 Melting point K 1071 Bonding radius A 1 .65 Boiling point K 3699 Atomic radius A 2 .7 Heat of vaporization kJ/mol 414 Ionization Potential V 5 .54 Heat of fusion kJ/mol 5 .46 Electronegativity - 1 .12 Specific heat J/gK 0 .19 The oxide is mildly basic. Crystal are face centered cubic. Electron config. : [Xe] 4f1 5d1 6s2
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