| Ho | Holmium | Atomic number : 67 Relative atomic mass (12C = 12.0000) : 164.93032 |
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| P H Y S I C A L D A T A | |
| Group 3 lanthanide Density / kg m-3 : 8795 [298 K] |
Melting point / K : 1747 Boiling point / K : 2968 |
| D I S C O V E R Y | |
| Holmium was discovered in 1878 by P.T. Cleve at Uppsala, Sweden, and independently by M. Delafontaine and J.L. Soret at Geneva, Switzerland. |
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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. : 1.4 Residence time / years : n.a. Classification : recycled Oxidation state : III |
Seawater / p.p.m. : Atlantic surface : 2.4 × 10-7 Atlantic deep : 2.9 × 10-7 Pacific surface : 1.6 × 10-7 Pacific deep : 5.8 × 10-7 |
| B I O L O G I C A L D A T A | |
| Level in humans Organs: n.a., but low |
Daily dietary intake : n.a. Total mass of element in average (70 kg) person : n.a. |
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A portrait of holmium is available on the Visual Elements site. Up to 200 individual items of information on this element are available in The Elements. |