| La | Lanthanum | Atomic number : 57 Relative atomic mass (12C = 12.0000) : 138.9055 |
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| P H Y S I C A L D A T A | |
| Group 3 transition metal Density / kg m-3 : 6145 [298 K] |
Melting point / K : 1194 Boiling point / K : 3730 |
| D I S C O V E R Y | |
| Discovered in 1839 by C.G. Mosander at Stockholm, Sweden. |
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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) : 13.5 Earth's crust / p.p.m. : 32 Residence time / years : 200 Classification : recycled Oxidation state : III |
Seawater / p.p.m. : Atlantic surface : 1.8 × 10-6 Atlantic deep : 3.8 × 10-6 Pacific surface : 2.6 × 10-6 Pacific deep : 6.9 × 10-6 |
| B I O L O G I C A L D A T A | |
| Level in humans Blood / mg dm-3 : n.a. Bone / p.p.m. : < 0.08 Liver / p.p.m. : 0.3 Muscle / p.p.m. : 0.0004 |
Daily dietary intake : n.a., but very low Total mass of element in average (70 kg) person : c. 0.8 mg |
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A portrait of lanthanum is available on the Visual Elements site. Up to 200 individual items of information on this element are available in The Elements. |