| Co | Cobalt | Atomic number : 27 Relative atomic mass (12C = 12.0000) : 58.93320 |
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| P H Y S I C A L D A T A | |
| Group 9 transition metal Density / kg m-3 : 8900 [293 K]; 7670 [liquid at m.p.] |
Melting point / K : 1768 Boiling point / K : 3143 |
| D I S C O V E R Y | |
| Discovered in 1735 by Georg Brandt at Stockholm, Sweden. |
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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) : 7.94 × 104 Earth's crust / p.p.m. : 20 Residence time / years : 40 Classification : scavenged Oxidation state : II |
Seawater / p.p.m. : Atlantic surface : n.a. Atlantic deep : n.a. Pacific surface : 6.9 × 10-6 Pacific deep : 1.1 × 10-6 |
| B I O L O G I C A L D A T A | |
| Level in humans Blood / mg dm-3 : 0.0002 - 0.04 Bone / p.p.m. : 0.01 - 0.04 Liver / p.p.m. : 0.06 - 1.1 Muscle / p.p.m. : 0.28 - 0.65 |
Daily dietary intake : 0.005 - 1.8 mg Total mass of element in average (70 kg) person : 3 mg |
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A portrait of cobalt is available on the Visual Elements site. Up to 200 individual items of information on this element are available in The Elements. |