Francium

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Next Element: Radium
87

Fr

223
Physical Properties
Color ---
Phase at Room Temp. solid
Density (g/cm3) ---
Hardness (Mohs) ---
Melting Point (K) 300.2
Boiling Point (K) ---
Heat of Fusion (kJ/mol) ---
Heat of Vaporization (kJ/mol) ---
Heat of Atomization (kJ/mol) 73
Thermal Conductivity (J/m sec K) ---
Electrical Conductivity (1/mohm cm) ---
Source Synthetic (U-235 decay)
Atomic Properties
Electron Configuration [RN]7s1
Number of Isotopes 41(0 natural)
Electron Affinity (kJ/mol) ---
First Ionization Energy (kJ/mol) 384
Second Ionization Energy (kJ/mol) ---
Third Ionization Energy (kJ/mol) ---
Electronegativity 0.7
Polarizability (Å3) 48.7
Atomic Weight 223
Atomic Volume (cm3/mol) ---
Ionic Radius2- (pm) ---
Ionic Radius1- (pm) ---
Atomic Radius (pm) ---
Ionic Radius1+ (pm) 194
Ionic Radius2+ (pm) ---
Ionic Radius3+ (pm) ---
Common Oxidation Numbers +1
Other Oxid. Numbers ---
Abundance
In Earth's Crust (mg/kg) ---
In Earth's Ocean (mg/L) ---
In Human Body (%) ---
Regulatory / Health
CAS Number 7440-73-5
OSHA Permissible Exposure Limit (PEL) No limit
OSHA PEL Vacated 1989 No limit
NIOSH Recommended Exposure Limit (REL) No limit
Sources:
University of Wisconsin General Chemistry
Mineral Information Institute
Jefferson Accelerator Laboratory
EnvironmentalChemistry.com
 
Glossary

Citation

(2007). Francium. Retrieved from http://www.eoearth.org/view/article/51cbedcf7896bb431f69419b

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