| B | Boron | Atomic number : 5 Relative atomic mass (12C = 12.0000) : 10.811 |
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| P H Y S I C A L D A T A | |
| Group 13 non-metal Density / kg m-3 : 2340 (beta-rhomb.) [293 K] |
Melting point / K : 2573 Boiling point / K : 3931 |
| D I S C O V E R Y | |
| Boron was discovered in 1808 by L.J. Lussac and L.J. Thenard in Paris, France and Sir Humphry Davy in 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) : 2.63 × 105 Earth's crust / p.p.m. : 950 Residence time / years : 1 × 107 Classification : accumulating Oxidation state : III |
Seawater / p.p.m. : 4.41 |
| B I O L O G I C A L D A T A | |
| Level in humans Blood / mg dm-3 : 0.13 Bone / p.p.m. : 1.1 - 3.3 Liver / p.p.m. : 0.4 - 3.3 Muscle / p.p.m. : 0.33 - 1 |
Daily dietary intake : 1 - 3 mg Total mass of element in average (70 kg) person : 18 mg |
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A portrait of boron is available on the Visual Elements site. Up to 200 individual items of information on this element are available in The Elements. |