| Property | Value |
|---|---|
| Atomic number | 81 |
| Atomic weight | 204.38332 amu |
| Element family | Other metals |
| Electronic configuration | 1s2 |
| Stable and very long lived isotopes | 203Tl: 29.524%, 205Tl: 70.476% |
| Previous element | Mercury |
| Next element | Lead |
| Density | 11.85 g/cm3 (STP) |
| Melting | 304 °C |
| Boiling | 1457 °C |
| Covalent radius | 1.44 Å |
| Van der Waals radius | 1.96 Å |
| Ionic radius | 1.5 Å |
| Metallic radius | 1.7 Å |
| First ionization potential | 6.109 eV |
| Electron affinity | 0.320 eV |
| Electronegativity | 1.62 |
| Discovery year | 1861 |
Thallium is an element number 81 from other metals family. Its symbol is Tl. Thallium atomic weight is 204.38332 amu. Tl stable and long lived isotopes are 203Tl: 29.524%, 205Tl: 70.476%. Thallium electronic configuration is 1s22s22p63s23p63d104s24p64d104f145s25p65d106s26p1. Sample compounds that contain Thallium are Tl2SO4, TlI, TlCl, Tl(NO2)3, Tl3PO4, TlOH.
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