Praseodymium (Pr)
Praseodymium (Pr) is element 59 of the periodic table, a lanthanide in period 6, in the f-block. Its standard atomic weight is 140.90766, so one mole of praseodymium atoms has a mass of 140.90766 g. At room temperature it is a solid; it melts at 930.85 °C and boils at 3519.85 °C.
| Atomic number | 59 |
|---|---|
| Symbol | Pr |
| Standard atomic weight | 140.90766 |
| Molar mass | 140.90766 g/mol |
| Category | Lanthanide |
| Group | f-block (lanthanide series) |
| Period | 6 |
| Block | f-block |
| Electron configuration | [Xe] 6s2 4f3 |
| Oxidation states | +3 |
| Electronegativity (Pauling) | 1.13 |
| Atomic radius (van der Waals) | 239 pm |
| First ionisation energy | 5.464 eV (527.2 kJ/mol) |
| Electron affinity | — |
| State at room temperature | Solid |
| Melting point | 1204 K (930.85 °C) |
| Boiling point | 3793 K (3519.85 °C) |
| Density | 6.77 g/cm³ |
| Discovered | 1885 |
Lanthanides
La · LanthanumCe · CeriumNd · NeodymiumPm · PromethiumSm · SamariumEu · EuropiumGd · GadoliniumTb · TerbiumDy · DysprosiumHo · HolmiumEr · ErbiumTm · ThuliumYb · Ytterbium
Calculate with Praseodymium
Atomic weight: IUPAC CIAAW standard atomic weight. Other properties: PubChem (U.S. National Library of Medicine, public domain). Values such as melting point and radius depend on how they were measured; check a data book for precise work.