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Rubidium
Block sPeriod 5Group 1solid at 20 °C
Configuration :[Kr] 5s¹
Atomic mass :85.4678 u
3D Bohr-model representation of the Rubidium atom (symbol Rb, atomic number Z=37). Electron shell configuration: 2, 8, 18, 8, 1 electrons.
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Bohr model · educational
Electron configuration
Full[Kr] 5s¹
Short[Kr] 5s¹
Valence electrons1
KLMNOPQ shells
K2
L8
M18
N8
O1
Electronegativity
Pauling0.82
Allen0.706
Mulliken (eV)—
Atomic radii
Empirical235 pm
Calculated265 pm
Covalent220 pm
Van der Waals303 pm
Ionic radii (Shannon-Prewitt)
+1152 pm
Successive ionisation energies
I₁403 kJ/mol
I₂2633 kJ/mol
I₃3860 kJ/mol
I₄5080 kJ/mol
I₅6850 kJ/mol
Electron affinity46.9 kJ/mol
Oxidation states
-1+1
Bold states = most common.