| Atomic Number: | 59 |
| Element Symbol: | Pr |
| Element Name: | Praseodymium |
| Atomic Weight: | 140.90765 |
| Group Name: | Lanthanoid |
| Period Number: | 6 (lanthanoid) |
| Block: | f-block |
| Ground State Configuration: | [Xe] 4f3 6s2 |
| Ground State Level: | 4Io9/2 |
| Standard State: | Solid |
| Bond Length: | 364.0 |
| Atomic Radius Empirical: | 185 |
| Atomic Radius Calculated: | 247 |
| Electron Affinity: | 50 |
| First Ionization Energy: | 527 |
| Pauling Electronegativity: | 1.13 |
| Allred Rochow Electronegativity: | 1.07 |
| Density Of Solid: | 6640 |
| Molar Volume: | 20.80 |
| Velocity Of Sound: | 2280 |
| Youngs Modulus: | 37 |
| Rigidity Modulus: | 15 |
| Bulk Modulus: | 29 |
| Poissons Ratio: | 0.28 |
| Brinell Hardness: | 481 |
| Vickers Hardness: | 400 |
| Electrical Resistivity: | 70 |
| Melting Point: | 935 |
| Boiling Point: | 3290 |
| Thermal Conductivity: | 13 |
| Coefficient Of Linear Expansion: | 6.7 |
| Enthalpy Of Fusion: | 6.9 |
| Enthalpy Of Vaporization: | 330 |
| Enthalpy Of Atmization: | 356 |
| Most Common Oxidation Numbers: | 3 |
| Color: | Silvery white, yellowish tinge |
| Classification: | Metallic |
| Discovered By: | Carl F. Auer von Welsbach |
| Discovered At: | Austria |
| Discovered When: | 1885 |
| Origin Of Name: | From the Greek words prasios didymos meaning green twin |
Calculate the molecular weight of Praseodymium or molecular weight Pr.
Also see the full list of chemical elements and atomic weights.