| Pm | Promethium | Atomic number : 61 Relative atomic mass (12C = 12.0000) : 144.9127 (Pm-145) |
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| P H Y S I C A L D A T A | |
| Group 3 lanthanide Density / kg m-3 : 7220 [298 K] |
Melting point / K : 1441 Boiling point / K : c. 3000 |
| D I S C O V E R Y | |
| Promethium was produced in 1945 by J.A. Marinksy, L.E. Glendenin and C.D. Coryell at Oak Bridge, Tennessee, USA. |
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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) : n.a. Earth's crust / p.p.m. : traces in uranium ores |
Seawater / p.p.m. : nil |
| B I O L O G I C A L D A T A | |
| Level in humans Organs: nil |
Daily dietary intake : nil Total mass of element in average (70 kg) person : nil |
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A portrait of promethium is available on the Visual Elements site. Up to 200 individual items of information on this element are available in The Elements. |