Americium

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95

Am

243.1
Physical Properties
Color silvery-white
Phase at Room Temp. solid
Density (g/cm3) 13.67
Hardness (Mohs) ---
Melting Point (K) 1267.2
Boiling Point (K) 2873
Heat of Fusion (kJ/mol) 10
Heat of Vaporization (kJ/mol) 238.5
Heat of Atomization (kJ/mol) ---
Thermal Conductivity (J/m sec K) ---
Electrical Conductivity (1/mohm cm) ---
Source Synthetic
Atomic Properties
Electron Configuration [Rn]7s25f7
Number of Isotopes 24 (0 natural)
Electron Affinity (kJ/mol) ---
First Ionization Energy (kJ/mol) 578
Second Ionization Energy (kJ/mol) ---
Third Ionization Energy (kJ/mol) ---
Electronegativity 1.3
Polarizability (Å3) 23.3
Atomic Weight 243.1
Atomic Volume (cm3/mol) 17.8
Ionic Radius2- (pm) ---
Ionic Radius1- (pm) ---
Atomic Radius (pm) 173
Ionic Radius1+ (pm) ---
Ionic Radius2+ (pm) ---
Ionic Radius3+ (pm) 111.5
Common Oxidation Numbers +3
Other Oxid. Numbers +2, +4, +5, +6
Abundance
In Earth's Crust (mg/kg) ---
In Earth's Ocean (mg/L) ---
In Human Body (%) ---
Regulatory / Health
CAS Number 7440-35-9
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

(2009). Americium. Retrieved from http://www.eoearth.org/view/article/51cbece87896bb431f68e66d

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