ChemiPlus Logo
Dictionary - Training


 General | States | Energies | Oxidation & Electrons | Appearance & Characteristics | Reactions | Other Forms Radius | Conductivity | Abundance


Name: Cerium Symbol: Ce
Group: Rare Earth, Lanthanide series Atomic weight: 140.12
Density @ 293 K: 6.78 g/cm3 Atomic volume: 20.67 cm3/mol
Group: Rare Earth, Lanthanide series discovered: 1803


state (s, l, g): s
melting point: 1071.2 K boiling point: 3743 K
Heat of fusion: 5.460 kJ/mol Heat of vaporization: 414.0 kJ/mol


1st ionization energy: 527.4 kJ/mole
electronegativity: 1.12 2nd ionization energy: 1047 kJ/mole
electron affinity: 50 kJ/mole 3rd ionization energy: 1949 kJ/mole
Specific heat: 0.19 J/gK heat atomization: 419 kJ/mole atoms

Oxidation & Electrons:

Shells: 2,8,18,20,8,2 electron configuration: [Xe] 4f2 6s2
minimum oxidation number: 0 maximum oxidation number: 4
min. common oxidation no.: 0 max. common oxidation no.: 4

Appearance & Characteristics:

structure: fcc: face-centered cubic color: silvery-white
uses: self-cleaning ovens(CeO2) toxicity:
hardness: mohs characteristics: malleable


reaction with air: vigorous, w/ht =>CeO2
reaction with 6M HCl: vigorous, =>H2, CeCl3 reaction with 6M HCl: vigorous, =>H2, CeCl3
reaction with 15M HNO3: mild, =>Ce(NO3)3 reaction with 6M NaOH:

Other Forms:

number of isotopes: 4 hydride(s): CeH2 CeH3
oxide(s): Ce2O3 CeO2 chloride(s): CeCl3


ionic radius (2- ion): pm ionic radius (1- ion): pm
atomic radius: 182 pm ionic radius (1+ ion): pm
ionic radius (2+ ion): pm ionic radius (3+ ion): 115 pm


thermal conductivity: 11.3 J/m-sec-deg
electrical conductivity: 13.333 1/mohm-cm polarizability: 29.6 A^3


source: Monazite(phosphate),bastnaesite
rel. abund. solar system: 0.055 log abundance earth's crust: 1.8 log
cost, pure: 57 $/100g cost, bulk: $/100g