Francium - a radioactive alkali metal which occurs very rarely in nature.
Symbol: Fr
Atomic Number: 87
Atomic Weight: 223 (most stable)
Boiling Point: 950 K
Melting Point: 300 K
Density at 300K: ??? g/cm3
Covalent radius: ???
Atomic radius: ???
Atomic volume: ??? cm3/mol
First ionization potental: ??? V
Specific heat capacity: ??? Jg-1K-1
Thermal conductivity: 15 Wm-1K-1
Electrical conductivity: ???*106Ω-1m-1
Heat of fusion: 2.1 kJ/mol
Heat of vaporization: 64 kJ/mol
Electronegativity: 0.7 (Pauling's)

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