Thallium
Elemental State Tl
Electron Configuration 1s22s22p63s23p63d104s24p64d104f145s25p65d106s26p1
First Ionization Potential 6.108 eV
Electron Affinity 0.2 eV
Z*  
Pauling Electronegativity 1.8
Covalent Radius 1.52 Å
Metallic Radius 1.71 Å
Ionic Radius 1.64 Å Tl+ coordination number = 6

0.89 Å Tl3+ coordination number = 4

1.025 Å Tl3+ coordination number = 6

van der Waal's Radius 1.96 Å
Melting Point 304 oC
Boiling Point 1473 oC
Density 11.85 g/cm3
Other Properties