Promethium
(Redirected from Pm)
| Promethium | |
|---|---|
| Pm | |
| In situ availability: | |
| Necessity: | |
| Atomic number: | 61 |
| Atomic mass: | [145] |
| group: | 19 |
| period: | N/A |
| normal phase: | Solid |
| series: | Lanthanide |
| density: | 7.26 g/cm3 |
| melting point: | 1315K, 1042°C, 1908°F |
| boiling point: | 3273K, 3000°C, 5432°F |
| Sr ← Y → Zr | |
| Nd ← Pm → Sm | |
| U ← Np → Pu | |
| Atomic radius (pm): | 185 |
| Bohr radius (pm): | 205 |
| Covalent radius (pm): | |
| Van der Waals radius (pm): | |
| ionic radius (pm): | (+3)109 |
| 1st ion potential (eV): | 5.55 |
| Electron Configuration | |
| 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f5 5s2 5p6 6s2 | |
| Electrons Per Shell | |
| 2, 8, 18, 23, 8, 2 | |
| Electronegativity: | |
| Electron Affinity: | - |
| Oxidation states: | 3 |
| Magnetism: | ? |
| Crystal structure: | Hexagonal |
Promethium is a Lanthanide metal.
It has a Hexagonal crystalline structure.
It does not have any isotopes considered to be natural. Its longest-lived known isotope has an atomic number of 145.
This element has no stable isotopes.
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