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Francium

Fr Francium
87
223.0197
7
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

KEY

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Francium

Columbia Encyclopedia

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