PERIODIC ELEMENT
Pr (Praseodymium)

 



Atomic number : 59
Atomic mass : 140.91 g.mol-1
Electronegativity according to Pauling : 1.1
Density : 6.8 g.cm-3 at 20 °C
Melting point : 931 °C
Boiling point : 3512 °C
Vanderwaals radius : unknown
Ionic radius : 0.101 nm (+3)
Isotopes : 5
Electronic shell : [ Xe ] 4f3 6s2
Energy of first ionisation : 522 kJ.mol-1
Energy of second ionisation : 1016 kJ.mol-1
Energy of third ionisation : 2082.4 kJ.mol-1
Energy of fourth ionisation : 3752 kJ.mol-1
Energy of fifth ionisation : 5534 kJ.mol-1
Standard Potential : - 2.47 V
Discovered by : von Welsbach in 1885
 
Atomic Structure Uses (coloring glass and ceramics )