| Pb | Lead | Atomic number : 82 Relative atomic mass (12C = 12.0000) : 207.2 |
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| P H Y S I C A L D A T A | |
| Group 14 metal Density / kg m-3 : 11 350 [293 K]; 10 678 [liquid at m.p.] |
Melting point / K : 600.65 Boiling point / K : 2013 |
| D I S C O V E R Y | |
| Known to ancient civilizations. |
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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) : 85.1 Earth's crust / p.p.m. : 14 Atmosphere / p.p.m. (volume) : trace Residence time / years : 50 Classification : scavenged Oxidation state : II |
Seawater / p.p.m. : Atlantic surface : 30 × 10-6 Atlantic deep : 4.0 × 10-6 Pacific surface : 10 × 10-6 Pacific deep : 1 × 10-6 |
| B I O L O G I C A L D A T A | |
| Level in humans Blood / mg dm-3 : 0.21 Bone / p.p.m. : 3.6 - 30 Liver / p.p.m. : 3 - 12 Muscle / p.p.m. : 0.23 - 3.3 |
Daily dietary intake : 0.06 - 0.5 mg Total mass of element in average (70 kg) person : 120 mg (stored in skeleton) |
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A portrait of lead is available on the Visual Elements site. Up to 200 individual items of information on this element are available in The Elements. |