Characteristics of the element
| Symbol: Pm |
| Name: Promethium |
| Latin name: Promethium |
| Atomic number: 61 |
| Atomic mass: 145 |
| Melting point: 1100 (°C) |
| Boiling point: 3000 (°C) |
| Density 7,26 (g/cm 3 ) |
| Electronegativity: 1,1 |
| Oxidation number: III |
| Number of neutrons: 84 |
| Crystal structure: Hexagonal |
| Chemical serie: Rare earth elements |
| Color: ----- |
| Electron configuration: 2-8-18-23-8-2 |
| Year of discovery:: 1945 |
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Update: 26.11.25
Update: 26.11.25