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Francium
Block sPeriod 7Group 1solid at 20 °C
Configuration :[Rn] 7s¹
Atomic mass :223 u
3D Bohr-model representation of the Francium atom (symbol Fr, atomic number Z=87). Electron shell configuration: 2, 8, 18, 32, 18, 8, 1 electrons.
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Bohr model · educational
Electron configuration
Full[Rn] 7s¹
Short[Rn] 7s¹
Valence electrons1
KLMNOPQ shells
K2
L8
M18
N32
O18
P8
Q1
Electronegativity
Pauling0.79
Allen—
Mulliken (eV)—
Atomic radii
Empirical260 pm
Calculated—
Covalent260 pm
Van der Waals348 pm
Ionic radii (Shannon-Prewitt)
+1180 pm
Successive ionisation energies
I₁380 kJ/mol
Electron affinity46.9 kJ/mol
Oxidation states
+1
Bold states = most common.