Terbium

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65

Tb

158.93
Physical Properties
Color silvery-white
Phase at Room Temp. solid
Density (g/cm3) 8.253
Hardness (Mohs) ---
Melting Point (K) 1633.2
Boiling Point (K) 3073
Heat of Fusion (kJ/mol) 16.3
Heat of Vaporization (kJ/mol) 293
Heat of Atomization (kJ/mol) 389
Thermal Conductivity (J/m sec K) 11.1
Electrical Conductivity (1/mohm cm) 8.8
Source Monazite (phosphate), bastnaesite
Atomic Properties
Electron Configuration [Xe]6s24f9
Number of Isotopes 52 (1 natural)
Electron Affinity (kJ/mol) 50
First Ionization Energy (kJ/mol) 564.7
Second Ionization Energy (kJ/mol) 1112
Third Ionization Energy (kJ/mol) 2114
Electronegativity 1.21
Polarizability (Å3) 25.5
Atomic Weight 158.93
Atomic Volume (cm3/mol) 19.3
Ionic Radius2- (pm) ---
Ionic Radius1- (pm) ---
Atomic Radius (pm) 177
Ionic Radius1+ (pm) ---
Ionic Radius2+ (pm) ---
Ionic Radius3+ (pm) 106.3
Common Oxidation Numbers +3
Other Oxid. Numbers +1, +4
Abundance
In Earth's Crust (mg/kg) 1.20×100
In Earth's Ocean (mg/L) 1.4×10-7
In Human Body (%) ---
Regulatory / Health
CAS Number 7440-27-9
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

(2006). Terbium. Retrieved from http://www.eoearth.org/view/article/51cbef057896bb431f69be7a

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