| Property | Unit | Value |
| Name | - | Thallium |
| Abbrevation | - | Tl |
| Atomic Number | - | 81 |
| Group | - | ME |
| Heat of Fusion | Kcal/g-mole | 0.99 |
| Heat of Vaporization | Kcal/g-mole | 39.258 |
| Molecular Weight | g/g-mole | 204.38330 |
| Melting Point | �C | 303.5 |
| Boiling Point | �C | 1456.85 |
| Refractive Index | - | N/A |
| Critical Temperature | �C | 2945.9 |
| Critical Pressure | atm | N/A |
| Critical Volume | cm�/g-mol | N/A |
| Atomic Volume | cm�/g-mol | 17.22 |
| Atomic Radii (Bragg-Slater) | pm | 200 |
| Atomic Radii (Covalent) | pm | N/A |
| Atomic Radii (Van der Walls) | pm | 190 |
| Density | g/cm� | 11.85000 |
| Oxidation State | - | 1,3 |
| Electron Configuration | - | [Xe]4f14 5d10 6s2 6p |
| Electron Affinity (Theory) | KJ/g-mol | 117 |
| Electron Affinity (Exp) | KJ/g-mol | 50 |
| Electronegativity (Pauling) | - | 1.62 |
| Electronegativity (Sanderson) | - | 1.36 |
| Electronegativity (Allred_Rochow) | - | 1.44 |
| Surface Tension @BP | dyn/cm | 467.0 |
| NMR Frequencies of Nuclei | MHz | 57.708 |
| Discovery Date | - | 1861 |
| Electric Resistivity | mohm-cm | 18 |
| Linear Thermal Expansion Coefficient | 1E-6 cm/cm/�C | 28 |
| Neutron Capture Cross Section | barns | 3.4 |
| Thermal Conductivity | W/m/K | 46.1 |
| Magnetic Susceptibility | 1e-9 m�/kg | -3.13 |
| Abundance, (Sun) | log(atoms/1E12 atoms H) | 0.9 |
| Abundance, (Meteorite) | log(atoms/atoms) | 0.9 |
| Abundance, (Earth) | log(pbbw) | 0.9 |
| Abundance, (Crust) | log(pbbw) | 2.6 |
| Abundance, (Ocean) | log(1E-12 mol/kg) | 1.8 |
| Abundance, (Body) | log(ppmw) | 0 |
| Electrical Conductivity | %IACS | N/A |
| Electrical Resistance | - | 18 |
| Photoelectric Work Function | eV | 3.76 |
| Hall's Coefficient | 1E-12* volt-cm/amp-Oe | N/A |
| Electrochemical Equivalent | mg/coulomb | 0.70601 |
| Young's Modulus of Elasticity | 1E-6 kg/cm� | 0.081 |
| Shear Modulus | 1E-6 kg/cm� | 0.028 |
| Bulk Modulus | 1E-6 kg/cm� | 0.3663 |
| Poisson's Ratio | - | 0.46 |
| Hardness | - | 2 |
| Hardness Unit | - | BRINELL |
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