| Nb | Niobium | Atomic number : 41 Relative atomic mass (12C = 12.0000) : 92.90638 |
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| P H Y S I C A L D A T A | |
| Group 5 transition metal Density / kg m-3 : 8570 [293 K]; 7830 [liquid at m.p.] |
Melting point / K : 2741 Boiling point / K : 5015 |
| D I S C O V E R Y | |
| Discovered in 1801 by C. Hatchett 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) : 79 Earth's crust / p.p.m. : 20 Residence time / years : n.a. Oxidation state : V |
Seawater / p.p.m. : 9 × 10-7 |
| B I O L O G I C A L D A T A | |
| Level in humans Blood / mg dm-3 : 0.005 Bone / p.p.m. : < 0.07 Liver / p.p.m. : 0.14 Muscle / p.p.m. : 0.14 |
Daily dietary intake : 0.02 - 0.6 mg Total mass of element in average (70 kg) person : 1.5 mg |
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A portrait of niobium is available on the Visual Elements site. Up to 200 individual items of information on this element are available in The Elements. |