| Ac | Actinium | Atomic number : 89 Relative atomic mass (12C = 12.0000) : 227.0728 (Ac-227) |
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| P H Y S I C A L D A T A | |
| Group 3 transition metal Density / kg m-3 : 10 060 [293 K] |
Melting point / K : 1320 ± 50 Boiling point / K : 3470 ± 300 |
| D I S C O V E R Y | |
| Discovered in 1899 by Andre Debierne 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) : n.a. Earth's crust / p.p.m. : minute traces |
Seawater / p.p.m. : nil |
| B I O L O G I C A L D A T A | |
| Level in humans nil |
Daily dietary intake : nil Total mass of element in average (70 kg) person : nil |
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A portrait of actinium is available on the Visual Elements site. Up to 200 individual items of information on this element are available in The Elements. |