PERIODIC ELEMENT
Pm (Promethium)

 



Atomic number : 61
Atomic mass : 147 g.mol-1
Electronegativity according to Pauling : unknown
Density : 6.475g cm-3 at 20 °C
Melting point : 1168 °C
Boiling point : 2460 °C
Vanderwaals radius : unknown
Ionic radius : unknown
Isotopes : 9
Electronic shell : [ Xe ] 4f5 6s2
Energy of first ionisation : 534.6 kJ.mol-1
Energy of second ionisation : 1050 kJ.mol-1
Standard potential : - 2.42 V
Discovered by : Marinsky 1945
 
Atomic Structure Uses ( No uses known)