Osmium vs Americium
| Property | Os Osmium | Am Americium |
|---|---|---|
| Atomic number | 76 | 95 |
| Symbol | Os | Am |
| Name | Osmium | Americium |
| Category | transition-metal | actinide |
| Standard Atomic Weight | 190.23 u | 243 u |
| Period | 6 | 7 |
| Group | 8 | N/A |
| Block | s | s |
| Phase at STP | solid | solid |
| Electron configuration | [Xe]6s24f145d6 | [Rn]7s25f7 |
| Oxidation states | [-4, -2, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8] | [2, 3, 4, 5, 6, 7] |
| Electronegativity (Pauling) | 2.2 | 1.3 |
| Electron affinity | 1.1 eV | 0.1 eV |
| Density | 2.258720e+4 kg/m³ | 1.369000e+4 kg/m³ |
| Melting point | 3032.85 °C | 1175.85 °C |
| Boiling point | 5011.85 °C | 2010.85 °C |
| Discovery year | 1803 | 1944 |