PERIODIC ELEMENT
Ba (Barium)

 



Atomic number : 56
Atomic mass : 137.33 g.mol-1
Electronegativity according to Pauling : 0.9
Density : 3.5 g.cm-3 at 20 °C
Melting point : 725 °C
Boiling point : 1640 °C
Vanderwaals radius : 0.222 nm
Ionic radius : 0.135 nm
Isotopes : 16
Electronic shell : [Xe] 6s2
Energy of first ionisation : 502.7 KJ.mol-1
Energy of second ionisation : 965 KJ.mol-1
Standard potential : - 2.90 V
Discovered by : Sir Humphrey Davy in 1808
 
Atomic Structure Uses (Medical applications, among others)