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|
Praseodymium
Chemical Properties & Compounds
| Symbol | Atomic Number | Atomic Weight | Melting Point | Boiling Point | Phase | Density | Classification |
| Pr | 59 | 140.90765 | 935 °C | 3520 °C | Solid | 6.77 g/cm3 | Metal |
|
|
|
| General |
| Name, Symbol, Number |
praseodymium, Pr, 59 |
| Chemical series |
lanthanides |
| Group, Period, Block |
n/a, 6, f |
| Appearance |
grayish white
 |
| Standard atomic weight |
140.90765(2) g·mol−1 |
| Electron configuration |
[Xe] 4f3 6s2 |
| Electrons per shell |
2, 8, 18, 21, 8, 2 |
| Physical properties |
| Phase |
solid |
| Density (near r.t.) |
6.77 g·cm−3 |
| Liquid density at m.p. |
6.50 g·cm−3 |
| Melting point |
1208 K
(935 °C, 1715 °F) |
| Boiling point |
3793 K
(3520 °C, 6368 °F) |
| Heat of fusion |
6.89 kJ·mol−1 |
| Heat of vaporization |
331 kJ·mol−1 |
| Heat capacity |
(25 °C) 27.20 J·mol−1·K−1 |
Vapor pressure
| P(Pa) |
1 |
10 |
100 |
1 k |
10 k |
100 k |
| at T(K) |
1771 |
1973 |
(2227) |
(2571) |
(3054) |
(3779) |
|
| Atomic properties |
| Crystal structure |
hexagonal |
| Oxidation states |
3
(mildly basic oxide) |
| Electronegativity |
1.13 (scale Pauling) |
Ionization energies
(more) |
1st: 527 kJ·mol−1 |
| 2nd: 1020 kJ·mol−1 |
| 3rd: 2086 kJ·mol−1 |
| Atomic radius |
185 pm |
| Atomic radius (calc.) |
247 pm |
| Miscellaneous |
| Magnetic ordering |
no data |
| Electrical resistivity |
(r.t.) (α, poly)
0.700 µΩ·m |
| Thermal conductivity |
(300 K) 12.5 W·m−1·K−1 |
| Thermal expansion |
(r.t.) (α, poly)
6.7 µm/(m·K) |
| Speed of sound (thin rod) |
(20 °C) 2280 m/s |
| Young's modulus |
(α form) 37.3 GPa |
| Shear modulus |
(α form) 14.8 GPa |
| Bulk modulus |
(α form) 28.8 GPa |
| Poisson ratio |
(α form) 0.281 |
| Vickers hardness |
400 MPa |
| Brinell hardness |
481 MPa |
| CAS registry number |
7440-10-0 |
| Selected isotopes |
|
|
| References |
|
Praseodymium Compounds
|
Source: Wikipedia article Praseodymium
|
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Chemistry Quick Facts
