Periodic Table of Elements showing Actinides


Atomic Number89
Molar Mass227.03 g mol-1
Electron Configuration[Rn]6d17s2
Normal Statesolid metal
Density @STP10.07 g cm-3
Melting Point1051oC
Boiling Point3200oC
Stable Isotopes169Tm
Atomic Radius188 pm
Ionic Radius118 (4+) pm
Electronegativity (Pauling)1.1
Ionization Energy (1st)499 kJ mol-1
Ionization Energy (2nd)1170 kJ mol-1
Ionization Energy (3rd)1900 kJ mol-1
Molar Heat Capacity27.2 J K-1mol-1
Standard Molar Entropy56.5 J K-1mol-1
Enthalpy of Fusion14.2 kJ mol-1
Enthalpy of Vapourization418 kJ mol-1

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