Thorium
Elemental State Th
Electron Configuration 1s22s22p63s23p63d104s24p64d104f145s25p65d106s26p67s26d2
First Ionization Potential 6.307 eV
Electron Affinity eV
Z*  
Pauling Electronegativity 1.3
Covalent Radius  
Metallic Radius 1.80 Å
Ionic Radius 1.08 Å Th4+ coordination number = 6

1.19 Å Th4+ coordination number = 8

1.23 Å Th4+ coordination number = 9

van der Waal's Radius  
Melting Point 1750 oC
Boiling Point 4788 oC
Density 11.72 g/cm3
Other Properties All isotopes are radioactive

232Th half-life = 1.4×1010 years