| U | Uranium | Atomic number : 92 Relative atomic mass (12C = 12.0000) : 238.0289 |
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| P H Y S I C A L D A T A | |
| Group 3 actinide Density / kg m-3 : 18 950 [293 K]; 17 907 [liquid at m.p.] |
Melting point / K : 1405.5 Boiling point / K : 4018 |
| D I S C O V E R Y | |
| Uranium was discovered in 1789 by M.J. Klaproth at Berlin, Germany. It was first isolated as the metal in 1841 by W.M. Peligot 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) : < 4 Earth's crust / p.p.m. : 2.4 Residence time / years : 300 000 Classification : accumulating Oxidation state : VI |
Seawater / p.p.m. : 3.13 × 10-3 |
| B I O L O G I C A L D A T A | |
| Level in humans Blood / mg dm-3 : 5 × 10-4 Bone / p.p.m. : (0.16 - 70) × 10-3 Liver / p.p.m. : 0.003 Muscle / p.p.m. : 0.0009 |
Daily dietary intake : 0.001 - 0.002 mg Total mass of element in average (70 kg) person : 0.1 mg (range 0.01 - 0.4 mg) |
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A portrait of uranium is available on the Visual Elements site. Up to 200 individual items of information on this element are available in The Elements. |