| Ba | Barium | Atomic number : 56 Relative atomic mass (12C = 12.0000) : 137.327 |
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| P H Y S I C A L D A T A | |
| Group 2 alkaline earth metal Density / kg m-3 : 3594 [293 K]; 3325 [liquid at m.p.] |
Melting point / K : 1002 Boiling point / K : 1910 |
| D I S C O V E R Y | |
| Discovered in 1808 by Sir Humphry Davy 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) : 123 Earth's crust / p.p.m. : 500 Residence time / years : 10 000 Classification : recycled Oxidation state : II |
Seawater / p.p.m. : Atlantic surface : 4.7 × 10-3 Atlantic deep : 9.3 × 10-3 Pacific surface : 4.7 × 10-3 Pacific deep : 20.0 × 10-3 |
| B I O L O G I C A L D A T A | |
| Level in humans Blood / mg dm-3 : 0.068 Bone / p.p.m. : 3 - 70 Liver / p.p.m. : 0.04 - 1.2 Muscle / p.p.m. : 0.09 |
Daily dietary intake : 0.6 - 1.7 mg Total mass of element in average (70 kg) person : 22 mg |
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A portrait of barium is available on the Visual Elements site. Up to 200 individual items of information on this element are available in The Elements. |