PERIODIC ELEMENT
Ra (Radium)

 



Atomic number : 88
Atomic mass : 226.0254 g.mol-1
Electronegativity according to Pauling : 0.9
Density : 5 g.cm-3 at 20 °C
Melting point : 700 °C
Boiling point : 1140 °C
Vanderwaals radius : 0.230 nm
Ionic radius : unknown
Isotopes : 6
Electronic shell : [Rn] 7s2
Energy of first ionisation : 509.1 KJ.mol-1
Energy of second ionisation : 975 KJ.mol-1
Discovered by : Pierre and Marie Curie 1898
 
Atomic Structure Uses (treating cancer)