Francium
Symbol
Fr
Atomic Number
87
Atomic Weight
223.0197
Element Classification
Discovered By
Marguerite Derey
Discovery Date
1939 (France)
Name Origin
Named for France, the nation of its discovery.
Density (g/cc)
n/a
Melting Point (K)
300
Boiling Point (K)
950
Appearance
n/a
Atomic Radius (pm)
n/a
Atomic Volume (cc/mol)
n/a
Covalent Radius (pm)
n/a
Ionic Radius
180 (+1e)
Specific Heat
n/a
Fusion Heat (kJ/mol)
15
Evaporation Heat (kJ/mol)
n/a
Thermal Conductivity (@25°C W/m K)
n/a
Debye Temperature (K)
n/a
Pauling Negativity Number
0.7
First Ionizing Energy (kJ/mol)
~375
Oxidation States
1
Electronic Configuration
[Rn] 7s1
Lattice Structure
Body-Centered Cubic(BCC)
Lattice Constant
n/a
Lattice C/A Ratio
n/a
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