Atomic Number95Molar Mass241.06 g mol-1
Electron Configuration[Rn]5f77s2Normal Statesolid metal
Density @STP13.67 g cm-3Melting Point1176oC
Boiling Point2011oCStable Isotopesnone
Atomic Radius184 pmIonic Radius107 (3+) pm
Electronegativity (Pauling)1.3Ionization Energy (1st)578 kJ mol-1
Ionization Energy (2nd)1158 kJ mol-1Ionization Energy (3rd)2161 kJ mol-1
Molar Heat Capacity J K-1mol-1Standard Molar Entropy J K-1mol-1
Enthalpy of Fusion kJ mol-1Enthalpy of Vapourization kJ mol-1
[Back to Periodic table] [ Home -]