| I | Iodine | Atomic number : 53 Relative atomic mass (12C = 12.0000) : 126.90447 |
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| P H Y S I C A L D A T A | |
| Group 17 non-metal Density / kg m-3 : 4930 [293 K] |
Melting point / K : 386.7 Boiling point / K : 457.50 |
| D I S C O V E R Y | |
| Discovered in 1811 by Bernard Courtois at Dijon, 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. : 0.14 Atmosphere / p.p.m. (volume) : trace Residence time / years : 300 000 Classification : scavenged as I(-I), recycled as I(V) Oxidation state : -I and V, mainly V |
Seawater / p.p.m. : Atlantic surface : 0.0489 Atlantic deep : 0.056 Pacific surface : 0.043 Pacific deep : 0.058 |
| B I O L O G I C A L D A T A | |
| Level in humans Blood / mg dm-3 : 0.057 Bone / p.p.m. : 0.27 Liver / p.p.m. : 0.7 Muscle / p.p.m. : 0.05 - 0.5 |
Daily dietary intake : 0.1 - 0.2 mg Total mass of element in average (70 kg) person : 12 - 20 mg |
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A portrait of iodine is available on the Visual Elements site. Up to 200 individual items of information on this element are available in The Elements. |