Atomic Number90Molar Mass232.04 g mol-1
Electron Configuration[Rn]6d27s2Normal Statesolid metal
Density @STP11.73 g cm-3Melting Point1750oC
Boiling Point4788oCStable Isotopes232Th
Atomic Radius180 pmIonic Radius99 (4+) pm
Electronegativity (Pauling)1.3Ionization Energy (1st)587 kJ mol-1
Ionization Energy (2nd)1110 kJ mol-1Ionization Energy (3rd)1978 kJ mol-1
Molar Heat Capacity27.3 J K-1mol-1Standard Molar Entropy51.8 J K-1mol-1
Enthalpy of Fusion19.2 kJ mol-1Enthalpy of Vapourization543.9 kJ mol-1
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