Thallium is a soft, malleable and highly poisonous post-transition metal from the periodic table. It is a grey-blue metal with a low melting point. Thallium is used in the production of photoelectric cells and in the manufacture of low-melting alloys.
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| Atomic number | 81 |
| Group | IIIA |
| Period | 6 |
| Mass | 204.3833 |
| Latin name | Thallium |
| Electron configuration | [Hg]6p |
| Oxidation state | -5, -2, -1, 0, 1, 2, 3 |