87
223 u
Fr
Francium
Alkali Metal
Atomic Structure
Physical State
Group
1
Period
7
Block
s
Electron Configuration
[Rn] 7s¹
Physical Properties
Atomic Mass:
223 u
Electronegativity:
0.7
Atomic Radius:
260 pm
Ionization Energy:
4 eV
Density:
1.87 g/cm³
Melting Point:
300 K
Boiling Point:
950 K
Historical Information
Discovered By:
Marguerite Perey
Year Discovered:
1939