Promethium

Previous Element: Neodymium

Next Element: Samarium
61

Pm

144.9
Physical Properties
Color silvery-white
Phase at Room Temp. solid
Density (g/cm3) 7.2
Hardness (Mohs) ---
Melting Point (K) 1353.2
Boiling Point (K) ---
Heat of Fusion (kJ/mol) 12.5
Heat of Vaporization (kJ/mol) ---
Heat of Atomization (kJ/mol) 301
Thermal Conductivity (J/m sec K) 17.9
Electrical Conductivity (1/mohm cm) 0
Source Synthetic
Atomic Properties
Electron Configuration [Xe]6s24f5
Number of Isotopes 47 (0 natural)
Electron Affinity (kJ/mol) 50
First Ionization Energy (kJ/mol) 535.9
Second Ionization Energy (kJ/mol) 1052
Third Ionization Energy (kJ/mol) 2150
Electronegativity 1.15
Polarizability (Å3) 30.1
Atomic Weight 144.9
Atomic Volume (cm3/mol) 20.1
Ionic Radius2- (pm) ---
Ionic Radius1- (pm) ---
Atomic Radius (pm) 183
Ionic Radius1+ (pm) ---
Ionic Radius2+ (pm) ---
Ionic Radius3+ (pm) 111
Common Oxidation Numbers +3
Other Oxid. Numbers ---
Abundance
In Earth's Crust (mg/kg) ---
In Earth's Ocean (mg/L) ---
In Human Body (%) ---
Regulatory / Health
CAS Number 7440-12-2
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). Promethium. Retrieved from http://www.eoearth.org/view/article/51cbeeab7896bb431f6997fc

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