Periodic Table of the Elements
Chemical & Physical Properties of Praseodymium
Praseodymium
| Latin name | Praseodymium |
| English name | Praseodymium |
| chemical symbol | Pr |
| atomic number | 59 |
| relative atomic mass | 140,90765 |
| period | 6 |
| group | III.B |
| classification | lanthanides |
| discovery year | 1885 |
| discoverer | C.A.Welsbach |
| melting point [°C] | 931 |
| boiling point [°C] | 3520 |
| density [g cm-3] | 6,77 |
| density at melting point [g cm-3] | 6,5 |
| electronegativity [Pauling] | 1,13 |
| oxidation states | II, III, IV |
| electron configuration | [Xe]4f3 6s2 |
| atomic radius [pm] | 247 |
| covalent radius [pm] | 164 |
| specific heat [J g-1K-1] | 0,19 |
| heat of fusion [kJ mol-1] | 6,89 |
| thermal conductivity [W m-1 K-1] | 13 |
| el. conductivity [S m-1] | 1,4.106 |
| 1. ionizing potential [eV] | 5,464 |
| 2. ionizing potential [eV] | 10,551 |
| 3. ionizing potential [eV] | 21,62 |
| Mohs hardness | N/A |
| Vickers hardness [MPa] | 400 |
| Brinell hardness [MPa] | 481 |
| shear modulus [GPa] | 15 |
| Young's modulus [GPa] | 37 |
| state at normal conditions | solid |
Resources
- Praseodym. In: Institut für Seltene Erden und Metalle e.V. [online]. 2012-03-29 [cit. 2012-06-11]. Available from: http://institut-seltene-erden.org/praseodym-pr-ordnungszahl-59/
- STWERTKA, Albert. A Guide to the Elements. Oxford: University Press, 2002. ISBN 0-19-515027-9.
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