| Atomic Number: | 61 |
| Element Symbol: | Pm |
| Element Name: | Promethium |
| Atomic Weight: | 145 |
| Group Name: | Lanthanoid |
| Period Number: | 6 (lanthanoid) |
| Block: | f-block |
| Ground State Configuration: | [Xe] 4f5 6s2 |
| Ground State Level: | 6Ho5/2 |
| Standard State: | Artificially prepared |
| Atomic Radius Empirical: | 185 |
| Atomic Radius Calculated: | 205 |
| Electron Affinity: | 50 |
| First Ionization Energy: | 540 |
| Allred Rochow Electronegativity: | 1.07 |
| Density Of Solid: | 7264 |
| Molar Volume: | 20.23 |
| Youngs Modulus: | 46 |
| Rigidity Modulus: | 18 |
| Bulk Modulus: | 33 |
| Poissons Ratio: | 0.28 |
| Electrical Resistivity: | 75 |
| Melting Point: | 1100 |
| Boiling Point: | 3000 |
| Thermal Conductivity: | 15 |
| Coefficient Of Linear Expansion: | 11 |
| Enthalpy Of Fusion: | about 7.7 |
| Enthalpy Of Vaporization: | 290 |
| Enthalpy Of Atmization: | about 350 |
| Most Common Oxidation Numbers: | 3 |
| Color: | Metallic |
| Classification: | Metallic |
| Discovered By: | J. A. Marinsky, Lawrence Glendenin, Charles D. Coryell |
| Discovered At: | United States |
| Discovered When: | 1945 |
| Origin Of Name: | Named after Prometheus in Greek mythology, who stole fire from the gods |
Calculate the molecular weight of Promethium or molecular weight Pm.
Also see the full list of chemical elements and atomic weights.