Periodic Table
87
Fr
223
Francium
Alkali MetalMost unstable of first 101 elements; extremely rare & radioactive.
Electronic Configuration
[Rn] 7s¹or1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹⁰ 6p⁶ 7s¹
Electron shells
2e⁻n=1
8e⁻n=2
18e⁻n=3
32e⁻n=4
18e⁻n=5
8e⁻n=6
1e⁻n=7
Properties
Atomic number
87
Atomic mass
223 u
Category
Alkali Metal
Block / Group / Period
s · 1 · 7
Valence electrons
1
Oxidation states
+1
Electronegativity
0.7
Atomic radius
348 pm
Ionization energy
380 kJ/mol
Electron affinity
47 kJ/mol
Melting point
300 K / 27 °C
Boiling point
950 K / 677 °C
Density
1.87 g/cm³
State at 25 °C
solid
Personal Notes
Add personal notes for Francium here...