Rubidium
Electron Configuration: 2,8,18,8,1
Enthalpy of Fusion (kJ mol-1): 2.2
Enthalpy of Vaporisation (kJ mol-1): 75.7
Atomic Radii
Atomic Radius 235 pm
Bohr Radius 265 pm
Covalent Radius 211 pm
Van der Waals 244 pm
Oxidation States
Main Rb-1 (in liquid NH3), Rb+1
Other
Ionisation Energies (kJ mol-1) show graph
M - M+ 403
M+ - M2+ 2632
M2+ - M3+ 3900
M3+ - M4+ 5080
M4+ - M5+ 6850
M5+ - M6+ 8140
M6+ - M7+ 9570
M7+ - M8+ 13100
M8+ - M9+ 14800
M9+ - M10+ 26740