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| Tl | Thallium | Metal |
| Atomic number: | 81 | Atomic weight: | 204.3833 | ||
| Shells: | 2,8,18,32,18,3 | Orbitals: | [Xe] 4f14 5d10 6s2 6p1 | ||
| Melting point: | 303.5°C | Boiling point: | 1457°C ±10°C | ||
| Covalent radius: | 1.48 | Å | Atomic volume: | 17.2 | cm³/mol |
| Atomic radius: | 2.08 | Å | Ionic radius: | 1.59 (+1) | Å |
| Electronegativity: | 2.04 | Oxidation states: | 3,(1) | ||
| 1st ionization pot.: | 6.1083 | V | 2nd ionization pot.: | 20.428 | V |
| 3rd ionization pot.: | 29.829 | V | Specific heat: | 0.13 | J/gK |
| Heat of fusion: | 4.142 | kJ/mol | Heat of vapor.: | 164.10 | kJ/mol |
| Thermal conduct.: | 0.461 | W/cmK | Electrical conduct.: | 0.0617 | 10^6/cm ohm |
| Density: | 11.85 | g/cm³ | Valence: | 1,3 |
