| Tl | Thallium | Atomic number : 81 Relative atomic mass (12C = 12.0000) : 204.3833 |
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| P H Y S I C A L D A T A | |
| Group 13 metal Density / kg m-3 : 11 850 [293 K]; 11 290 [liquid at m.p.] |
Melting point / K : 576.7 Boiling point / K : 1730 |
| D I S C O V E R Y | |
| Thallium was discovered in 1861 by William Crookes at London, England. Isolated in 1862 by C.A. Lamy at Paris, France. |
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| G E O L O G I C A L D A T A | |
| Abundances Sun (relative to H = 1 × 1012) : 8.0 Earth's crust / p.p.m. : 0.6 Residence time / years : 10 000 Classification : accumulating Oxidation state : I |
Seawater / p.p.m. : 1.4 × 10-5 |
| B I O L O G I C A L D A T A | |
| Level in humans Blood / mg dm-3 : 0.00048 Bone / p.p.m. : 0.002 Liver / p.p.m. : 0.004 - 0.033 Muscle / p.p.m. : 0.07 |
Daily dietary intake : 0.0015 mg Total mass of element in average (70 kg) person : 0.5 mg |
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A portrait of thallium is available on the Visual Elements site. Up to 200 individual items of information on this element are available in The Elements. |