Periodic Table of Elements showing Thorium actinide elements


Atomic Number90
Molar Mass232.04 g mol-1
Electron Configuration[Rn]6d27s2
Normal Statesolid metal
Density @STP11.73 g cm-3
Melting Point1750oC
Boiling Point4788oC
Stable Isotopes232Th
Atomic Radius180 pm
Ionic Radius99 (4+) pm
Electronegativity (Pauling)1.3
Ionization Energy (1st)587 kJ mol-1
Ionization Energy (2nd)1110 kJ mol-1
Ionization Energy (3rd)1978 kJ mol-1
Molar Heat Capacity27.3 J K-1mol-1
Standard Molar Entropy51.8 J K-1mol-1
Enthalpy of Fusion19.2 kJ mol-1
Enthalpy of Vapourization543.9 kJ mol-1
[Back to Periodic table]

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