Promethium vs Platinum
| Property | Pm Promethium | Pt Platinum |
|---|---|---|
| Atomic number | 61 | 78 |
| Symbol | Pm | Pt |
| Name | Promethium | Platinum |
| Category | lanthanide | transition-metal |
| Standard Atomic Weight | 145 u | 195.084 u |
| Period | 6 | 6 |
| Group | N/A | 10 |
| Block | s | s |
| Phase at STP | solid | solid |
| Electron configuration | [Xe]6s24f5 | [Xe]6s14f145d9 |
| Oxidation states | [2, 3] | [-3, -2, -1, 0, 1, 2, 3, 4, 5, 6] |
| Electronegativity (Pauling) | N/A | 2.28 |
| Electron affinity | 0.129 eV | 2.1228 eV |
| Density | 7260 kg/m³ | 2.146000e+4 kg/m³ |
| Melting point | 1041.85 °C | 1768.4 °C |
| Boiling point | 2999.85 °C | 3824.85 °C |
| Discovery year | 1902 | 1735 |