Europium

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63

Eu

151.96
Physical Properties
Color silvery-white
Phase at Room Temp. solid
Density (g/cm3) 5.245
Hardness (Mohs) ---
Melting Point (K) 1095.2
Boiling Point (K) 1712
Heat of Fusion (kJ/mol) 10.5
Heat of Vaporization (kJ/mol) 176
Heat of Atomization (kJ/mol) 178
Thermal Conductivity (J/m sec K) 13.9
Electrical Conductivity (1/mohm cm) 11
Source Monazite (phosphate), bastnaesite
Atomic Properties
Electron Configuration [Xe]6s24f7
Number of Isotopes 45 (2 natural)
Electron Affinity (kJ/mol) 50
First Ionization Energy (kJ/mol) 546.7
Second Ionization Energy (kJ/mol) 1085
Third Ionization Energy (kJ/mol) 2405
Electronegativity 1.12
Polarizability (Å3) 27.7
Atomic Weight 151.96
Atomic Volume (cm3/mol) 29
Ionic Radius2- (pm) ---
Ionic Radius1- (pm) ---
Atomic Radius (pm) 208
Ionic Radius1+ (pm) ---
Ionic Radius2+ (pm) 131
Ionic Radius3+ (pm) 108.7
Common Oxidation Numbers +2, +3
Other Oxid. Numbers ---
Abundance
In Earth's Crust (mg/kg) 2.00×100
In Earth's Ocean (mg/L) 1.3×10-7
In Human Body (%) ---
Regulatory / Health
CAS Number 7440-53-1
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). Europium. Retrieved from http://www.eoearth.org/view/article/51cbedc27896bb431f693ba4

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