| Ir | Iridium | Atomic number : 77 Relative atomic mass (12C = 12.0000) : 192.217 |
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| P H Y S I C A L D A T A | |
| Group 9 transition metal Density / kg m-3 : 22 560 [290 K]; 20 000 [liquid at m.p.] |
Melting point / K : 2683 Boiling point / K : 4403 |
| D I S C O V E R Y | |
| Discovered in 1803 by S.Tennant at London, England. |
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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) : 7.1 Earth's crust / p.p.m. : c. 3 × 10-6 Residence time / years : n.a. |
Seawater / p.p.m. : n.a., but very low |
| B I O L O G I C A L D A T A | |
| Level in humans Blood / mg dm-3 : n.a., but very low Bone / p.p.m. : n.a. Liver / p.p.m. : n.a. Muscle / p.p.m. : c. 2 × 10-5 |
Daily dietary intake : n.a., but very low Total mass of element in average (70 kg) person : n.a. |
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A portrait of iridium is available on the Visual Elements site. Up to 200 individual items of information on this element are available in The Elements. |