| 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 | |