Periodic Table of the Elements
Chemical & Physical Properties of Promethium
Promethium
| Latin name | Promethium |
| English name | Promethium |
| chemical symbol | Pm |
| atomic number | 61 |
| relative atomic mass | (144,9127) |
| period | 6 |
| group | III.B |
| classification | lanthanides |
| discovery year | 1945 |
| discoverer | Marinsky, Glendenin Coryell |
| melting point [°C] | 1042 |
| boiling point [°C] | 3000 |
| density [g cm-3] | 6,475 |
| electronegativity [Pauling] | 1,13 |
| oxidation states | III |
| electron configuration | [Xe]4f5 6s2 |
| atomic radius [pm] | 205 |
| specific heat [J g-1K-1] | 0,18 |
| heat of fusion [kJ mol-1] | 7,7 |
| thermal conductivity [W m-1 K-1] | 15 |
| el. conductivity [S m-1] | 1,3.106 |
| 1. ionizing potential [eV] | 5,55 |
| 2. ionizing potential [eV] | 10,903 |
| 3. ionizing potential [eV] | 22,283 |
| shear modulus [GPa] | 18 |
| Young's modulus [GPa] | 46 |
| state at normal conditions | solid |
Promethium is an artificial radioactive metallic element. Does not occur in nature and has no practical use.
Resources
- HUSTED, Robert; et al. Promethium. In: LOS ALAMOS NATIONAL SECURITY. Los Alamos National Lab [online]. 2011 [cit. 2012-06-27]. Available from http://periodic.lanl.gov/61.shtml
- Promethium. In: Institut für Seltene Erden und Metalle e.V. [online]. 2012-03-29 [cit. 2012-04-21]. Available from: http://institut-seltene-erden.org/promethium/
© 2009-2015 | www.prvky.com | kontakt
