PERIODIC ELEMENT
Ac (Actinium)

 



Atomic number : 89
Atomic mass : 227 g mol-1
Electronegativity according to Pauling : 1.1
Density : 10.07 g cm-3 at 20 °C
Melting point : 1050 °C
Boiling point : 3250 °C
Vanderwaals radius : unknown
Ionic radius : unknown
Isotopes : 4
Electronic shell : [ Rn ] 6d1 7s2
Energy of first ionisation : 664.6  kJ.mol-1
Energy of second ionisation : 1165 kJ.mol-1
Discovered by : André Debierne in 1899
 
Atomic Structure Uses(No uses known)