PERIODIC ELEMENT
Rb (Rubidium)

 



Atomic number : 37
Atomic mass : 85.4679 g.mol-1
Electronegativity according to Pauling : 0.8
Density : 1.53 g.cm-3 at 20 °C
Melting point : 39 °C
Boiling point : 696 °C
Vanderwaals radius : 0.243 nm
Ionic radius : 0.149 (+1) nm
Isotopes : 11
Electronic shell : [Kr] 5s1
Energy of first ionisation : 402.9 kJ.mol-1
Energy of second ionisation : 2633 kJ.mol-1
Energy of third ionisation : 3860 kJ.mol-1
Standard potential : - 2.99 V
Discovered by : Robert Wilhem Bunsen and Gustav Robert Kirchhoff in 1861
Atomic Structure Uses (catalyst, photocells)