| Praseodymium | |
| Electrons per shell | 2,8,18,21,8,2 |
| Electron Configuration | [Xe] 4f3 6s2 ![]() |
| Ground state | 4I°9/2 |
| Atomic Volume | 20.8 cm3 mol-1 |
| Electronegativity | 1.13 |
| Magnetic ordering | No data |
| Mass magnetic susceptibility | 4.23 x 10-7 |
| Molar magnetic susceptibility | 5.9604 x 10-8 |
| Speed of sound | 2280 m s-1 |
Thermal Properties |
|
| Enthalpy of Atomization | 368 kJ mol-1 @25°C |
| Enthalpy of Fusion | 11.3 kJ mol-1 |
| Enthalpy of Vaporisation | 357 kJ mol-1 |
| Heat Capacity | 27.20 J mol-1 K-1 |
| Thermal Conductivity | 12.5 W m-1 K-1 |
| Thermal Expansion | 6.7 μm m-1 K-1 |
| Critcal Temperature | No data. |
| Critcal Pressure | No data. |
| Adiabatic index | No data. |
Hardness |
|
| Brinell hardness | 481 MPa |
| Vickers hardness | 400 MPa |
Elastic Properties |
|
| Bulk modulus | 28.8 GPa |
| Poisson ratio | 0.281 |
| Shear modulus | 14.8 GPa |
| Young's modulus | 37.3 GPa |
Electrical Properties |
|
| Electrical resistivity | 7.0 x 10-7 Ω m |
| Electrical conductivity | 0.0148 106/cm Ω |
Chemical Properties |
|
| Electrochemical Equivalent | 1.7524 g Ah-1 |
| Electron Work Function | 2.7 eV |
| Valence Electron Potential (-eV) | 42.64 |
| Ionization Potential | |
| 5.46 | |
| 10.551 | |
| 21.62 | |
Energy Levels |
|
| 36.0263 KeV | |
| 35.5502 KeV | |
| 40.7482 KeV | |
| 41.7557 KeV | |
| 40.6435 KeV | |
| 5.0337 KeV | |
| 5.0135 KeV | |
| 5.4889 KeV | |
| 5.85 KeV | |
| 5.5943 KeV | |
| 5.4977 KeV | |
| 6.3221 KeV | |
| 6.5998 KeV | |
| 4.934 KeV | |
| 4.4614 KeV | |
Atomic Radii |
|
| 185 pm | |
| 247 pm | |
| No data. | |
| No data. | |
| 128 pm | |
| 182.4 pm | |
Ionic Radii (Å) |
||||
| Charge | Coordination | Crystal | Ionic | Key |
| 3 | VI | 1.13 | 0.99 | R |
| VIII | 1.266 | 1.126 | R | |
| IX | 1.319 | 1.179 | R | |
| 4 | VI | 0.99 | 0.85 | R |
| VIII | 1.1 | 0.96 | R | |
| R, From r3 vs V plots. |
| C, Calculated from bond length - bond strength equations. |
| E, Estimated. |
| *, Most Reliable. |
| M, From Metallic Oxides. |
| A, Ahrens (1952) Ionic radius. |
| P, Pauling's (1960) Crystal Radius. |
Oxidation States |
|
| Pr+3 | |
| Pr+4 | |
Ionisation Energies (kJ mol-1) ![]() |
|
| 523.1 | |
| 1018 | |
| 2086 | |
| 3761 | |
| 5543 | |
Vapour Pressure |
||||||
| P (Pa) | 1 | 10 | 100 | 1K | 10K | 100K |
| T (K) | 1771 | 1973 | (2227) | (2571) | (3054) | (3779) |
Crystal Structure |
|
| Hexagonal close packed | |
![]() |
a = 367.25 pm |
| b = 367.25 pm | |
| c = 1183.54 pm | |
| α = 90° | |
| β = 90° | |
| γ = 120° | |