| Property | Value |
|---|---|
| Atomic number | 61 |
| Atomic weight | 146.9151 amu |
| Element family | N/A |
| Electronic configuration | 1s2 |
| Stable and very long lived isotopes | None |
| Previous element | Neodymium |
| Next element | Samarium |
| Density | 7.26 g/cm3 (STP) |
| Melting | 931 °C |
| Boiling | 2730 °C |
| Covalent radius | 1.73 Å |
| Ionic radius | 0.979 Å |
| Metalic radius | 1.834 Å |
| First ionization potential | 5.597 eV |
| Electron affinity | 0.129 eV |
| Electronegativity | 1.13 |
| Discovery year | 1945 |
Promethium is an element number 61 from n/a family. Its symbol is Pm. Promethium atomic weight is 146.9151 amu. Pm has no stable or long lived isotopes. Promethium electronic configuration is 1s22s22p63s23p63d104s24p64d105s25p66s24f5. Promethium density is 7.26 g/cm3 (STP). Promethium melting point is 931 °C. Promethium boiling point is 2730 °C. Promethium covalent radius is 1.73 Å. Promethium ionic radius is 0.979 Å. Promethium covalent radius is 1.834 Å. Promethium first ionization potential is 5.597 eV. Promethium first ionization potential is 0.129 eV. Promethium electronegativity by Pauling scale is 1.13. Promethium was discovered in 1945.
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