Ytterbium

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70

Yb

173.04
Physical Properties
Color silvery-white
Phase at Room Temp. solid
Density (g/cm3) 6.973
Hardness (Mohs) ---
Melting Point (K) 1097.2
Boiling Point (K) 1700
Heat of Fusion (kJ/mol) 9.2
Heat of Vaporization (kJ/mol) 159
Heat of Atomization (kJ/mol) 152
Thermal Conductivity (J/m sec K) 34.9
Electrical Conductivity (1/mohm cm) 35.7
Source Monazite (phosphate), bastnaesite
Atomic Properties
Electron Configuration [Xe]6s24f14
Number of Isotopes 37 (7 natural)
Electron Affinity (kJ/mol) 50
First Ionization Energy (kJ/mol) 603.4
Second Ionization Energy (kJ/mol) 1176
Third Ionization Energy (kJ/mol) 2415
Electronegativity 1.21
Polarizability (Å3) 21
Atomic Weight 173.04
Atomic Volume (cm3/mol) 24.8
Ionic Radius2- (pm) ---
Ionic Radius1- (pm) ---
Atomic Radius (pm) 193
Ionic Radius1+ (pm) ---
Ionic Radius2+ (pm) 116
Ionic Radius3+ (pm) 100.8
Common Oxidation Numbers +3
Other Oxid. Numbers +2
Abundance
In Earth's Crust (mg/kg) 3.2×100
In Earth's Ocean (mg/L) 8.2×10-7
In Human Body (%) ---
Regulatory / Health
CAS Number 7440-64-4
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). Ytterbium. Retrieved from http://www.eoearth.org/view/article/51cbef4c7896bb431f69d789

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