Promethium
Electron Configuration
|
General Properties
| Atomic Symbol | Pm |
| Atomic Weight | 145 (most stable) g/mol |
| Element Number | 61 |
| Standard State | Syntethically prep. |
| Standard Type | Weakly Acidic |
| Date of Discovery | 1941 |
| Discoverer | Marinsky & Glendinin |
Physical Properties
| Oxidation States | 3 |
| Boiling Point | 3273 K |
| Melting Point | 1315 K |
| Density | 7.22 g/cm³ |
| Electron Configuration | [Xe]4f5,6s2 |
| Acid/Base Properties | Basic |
| Crystal Structure | Hexagonal |
| Electronegativity | 1.13 |
| Heat of Vaporization | -- |
| Heat of Fusion | -- |
| Electrical Conductivity | 2 10^6omg-¹cm-¹ |
| Thermal Conductivity | 17.9 (300K) Wm-¹K-¹ (at 300 K) |
| Specific Heat Capacity | -- |
| First Ionization Potential | 5.55 |
| Atomic Volume | 22.4 cm³/mol |
| Atomic Radius | -- |
| Covalent Radius | 1.63 Å |
| Synthetic | Yes |