Cerium

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58

Ce

140.12
Physical Properties
Color silvery-white
Phase at Room Temp. solid
Density (g/cm3) 6.773
Hardness (Mohs) ---
Melting Point (K) 1071.2
Boiling Point (K) 3743
Heat of Fusion (kJ/mol) 8.9
Heat of Vaporization (kJ/mol) 398
Heat of Atomization (kJ/mol) 419
Thermal Conductivity (J/m sec K) 11.3
Electrical Conductivity (1/mohm cm) 13.333
Source Monazite (phosphate), bastnaesite
Atomic Properties
Electron Configuration [Xe]6s24f15d1
Number of Isotopes 44 (4 natural)
Electron Affinity (kJ/mol) 50
First Ionization Energy (kJ/mol) 527.4
Second Ionization Energy (kJ/mol) 1047
Third Ionization Energy (kJ/mol) 1949
Electronegativity 1.12
Polarizability (Å3) 29.6
Atomic Weight 140.12
Atomic Volume (cm3/mol) 20.7
Ionic Radius2- (pm) ---
Ionic Radius1- (pm) ---
Atomic Radius (pm) 182
Ionic Radius1+ (pm) ---
Ionic Radius2+ (pm) ---
Ionic Radius3+ (pm) 115
Common Oxidation Numbers +3, +4
Other Oxid. Numbers +2
Abundance
In Earth's Crust (mg/kg) 6.65x101
In Earth's Ocean (mg/L) 1.2x10-6
In Human Body (%) 0.00006%
Regulatory / Health
CAS Number 7440-45-1
OSHA Permissible Exposure Limit (PEL) No limits
OSHA PEL Vacated 1989 No limits
NIOSH Recommended Exposure Limit (REL) No limits
Sources:
University of Wisconsin General Chemistry
Mineral Information Institute
Jefferson Accelerator Laboratory
EnvironmentalChemistry.com
 
Glossary

Citation

(2008). Cerium. Retrieved from http://www.eoearth.org/view/article/51cbed357896bb431f690899

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