Rubidium
Elemental State Rb
Electron Configuration 1s22s22p63s23p63d104s24p65s1
First Ionization Potential 4.177 eV
Electron Affinity 0.486 eV
Z*  
Pauling Electronegativity 0.82
Covalent Radius 2.11 Å
Metallic Radius 2.50 Å
Ionic Radius 1.66 Å Rb+ coordination number = 6

1.70 Å Rb+ coordination number = 7

1.75 Å Rb+ coordination number = 8

van der Waal's Radius  
Melting Point 39.31 oC
Boiling Point 688 oC
Density 1.532 g/cm3
Other Properties