A portrait of thorium is available on the Visual Elements site. Up to 200 individual items of information on this element are available in The Elements.
| Th | Thorium |
Atomic number : 90
Relative atomic mass (12C = 12.0000) : 232.0381 |
|||||||
| P H Y S I C A L D A T A | |
|
Group 3 actinide Density / kg m-3 : 11 720 [293 K] |
Melting point / K : 2023 Boiling point / K : c. 5060 |
| D I S C O V E R Y | |
|
Discovered in 1829 by J.J. Berzelius at Stockholm, Sweden. |
|
| G E O L O G I C A L D A T A | |
|
Abundances Sun (relative to H = 1 × 1012) : c. 2 Earth's crust / p.p.m. : 12 Residence time / years : 50 Classification : scavenged Oxidation state : IV |
Seawater / p.p.m. : 9.2 × 10-6 |
| B I O L O G I C A L D A T A | |
|
Level in humans Blood / mg dm-3 : 0.00016 Bone / p.p.m. : 0.002 - 0.012 Liver / p.p.m. : n.a. Muscle / p.p.m. : n.a. |
Daily dietary intake : 0.00005 - 0.003 mg Total mass of element in average (70 kg) person : c. 0.1 mg |
|
|
A portrait of thorium is available on the Visual Elements site. Up to 200 individual items of information on this element are available in The Elements. |