| Rb | Rubidium | Atomic number : 37 Relative atomic mass (12C = 12.0000) : 85.4678 |
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| P H Y S I C A L D A T A | |
| Group 1 alkali metal Density / kg m-3 : 1532 [293 K]; 1475 [liquid at m.p.] |
Melting point / K : 312.2 Boiling point / K : 961 |
| D I S C O V E R Y | |
| Rubidium was discovered in 1861 by R.W. Bunsen and G. Kirchoff at the University of Heidelberg, Germany. |
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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) : 400 Earth's crust / p.p.m. : 90 Classification : accumulating Oxidation state : I |
Seawater / p.p.m. : 0.12 |
| B I O L O G I C A L D A T A | |
| Level in humans Blood / mg dm-3 : 2.49 Bone / p.p.m. : 0.5 - 5 Liver / p.p.m. : 20 - 70 Muscle / p.p.m. : 20 - 70 |
Daily dietary intake : 1.5 - 6 mg Total mass of element in average (70 kg) person : 680 mg |
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A portrait of rubidium is available on the Visual Elements site. Up to 200 individual items of information on this element are available in The Elements. |