| Ca | Calcium | Atomic number : 20 Relative atomic mass (12C = 12.0000) : 40.078 |
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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 : 1550 [293 K]; 1365 [liquid at m.p.] |
Melting point / K : 1112 Boiling point / K : 1757 |
| D I S C O V E R Y | |
| Isolated 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) : 2.24 × 106 Earth's crust / p.p.m. : 41 000 Residence time / years : 1 × 106 Classification : recycled Oxidation state : II |
Seawater / p.p.m. : Atlantic surface : 390 Atlantic deep : 430 Pacific surface : 390 Pacific deep : 440 |
| B I O L O G I C A L D A T A | |
| Level in humans Blood / mg dm-3 : 60.5 Bone / p.p.m. : 170 000 Liver / p.p.m. : 100 - 360 Muscle / p.p.m. : 140 - 700 |
Daily dietary intake : 600 - 1400 mg Total mass of element in average (70 kg) person : 1.00 kg |
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A portrait of calcium is available on the Visual Elements site. Up to 200 individual items of information on this element are available in The Elements. |