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Promethium
Chemical Properties & Compounds
| Symbol | Atomic Number | Atomic Weight | Melting Point | Boiling Point | Phase | Density | Classification |
| Pm | 61 | 145 | 1042 °C | 3000 °C | Solid | 7.26 g/cm3 | Metal  |
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| General |
| Name, Symbol, Number |
promethium, Pm, 61 |
| Chemical series |
lanthanides |
| Group, Period, Block |
n/a, 6, f |
| Appearance |
metallic |
| Standard atomic weight |
[145](0) g·mol−1 |
| Electron configuration |
[Xe] 4f5 6s2 |
| Electrons per shell |
2, 8, 18, 23, 8, 2 |
| Physical properties |
| Phase |
solid |
| Density (near r.t.) |
7.26 g·cm−3 |
| Melting point |
1315 K
(1042 °C, 1908 °F) |
| Boiling point |
3273 K
(3000 °C, 5432 °F) |
| Heat of fusion |
7.13 kJ·mol−1 |
| Heat of vaporization |
289 kJ·mol−1 |
| Atomic properties |
| Crystal structure |
hexagonal |
| Oxidation states |
3
(mildly basic oxide) |
| Electronegativity |
? 1.13 (scale Pauling) |
Ionization energies
(more) |
1st: 540 kJ·mol−1 |
| 2nd: 1050 kJ·mol−1 |
| 3rd: 2150 kJ·mol−1 |
| Atomic radius |
185 pm |
| Atomic radius (calc.) |
205 pm |
| Miscellaneous |
| Magnetic ordering |
no data |
| Electrical resistivity |
(r.t.) est. 0.75 µΩ·m |
| Thermal conductivity |
(300 K) 17.9 W·m−1·K−1 |
| Thermal expansion |
(r.t.) (α, poly)
est. 11 µm/(m·K) |
| Young's modulus |
(α form) est. 46 GPa |
| Shear modulus |
(α form) est. 18 GPa |
| Bulk modulus |
(α form) est. 33 GPa |
| Poisson ratio |
(α form) est. 0.28 |
| CAS registry number |
7440-12-2 |
| Selected isotopes |
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| References |
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Promethium Compounds
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Source: Wikipedia article Promethium
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Chemistry Quick Facts