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Tallium (lühend Tl) on element järjekorranumbriga 81.
| 81 |
3 18 32 18 8 2 |
| Tl 204,37 |
|
| Tallium |
Tal on 2 stabiilset isotoopi, massiarvudega 203 ja 205.
Omadustelt on tallium metall. Tema tihedus normaaltingimustel on 11,85 g/cm3 ja sulamistemperatuur on 304 Celsiuse kraadi.
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