Atomic Number64Molar Mass157.25 gmol-1
Electron Configuration[Xe]4f75d16s2Normal Statesolid metal
Density @STP7.87 g cm-3Melting Point1313oC
Boiling Point3273oCStable Isotopes152Gd, 154Gd, 155Gd, 156Gd, 157Gd, 158Gd, 160Gd
Atomic Radius180 pmIonic Radius97 (3+) pm
Electronegativity (Pauling)1.2Ionization Energy (1st)593 kJ mol-1
Ionization Energy (2nd)1167 kJ mol-1Ionization Energy (3rd)1990 kJ mol-1
Molar Heat Capacity37 J K-1mol-1Standard Molar Entropy68.1 J K-1mol-1
Enthalpy of Fusion15.5 kJ mol-1Enthalpy of Vapourization311.7 kJ mol-1
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