Niobium vs Curium
| Property | Nb Niobium | Cm Curium |
|---|---|---|
| Atomic number | 41 | 96 |
| Symbol | Nb | Cm |
| Name | Niobium | Curium |
| Category | transition-metal | actinide |
| Standard Atomic Weight | 92.90637 u | 247 u |
| Period | 5 | 7 |
| Group | 5 | N/A |
| Block | s | s |
| Phase at STP | solid | solid |
| Electron configuration | [Kr]5s14d4 | [Rn]7s25f76d1 |
| Oxidation states | [-3, -1, 0, 1, 2, 3, 4, 5] | [3, 4, 5, 6] |
| Electronegativity (Pauling) | 1.6 | 1.3 |
| Electron affinity | 0.893 eV | 0.277 eV |
| Density | 8570 kg/m³ | 1.351000e+4 kg/m³ |
| Melting point | 2476.85 °C | 1344.85 °C |
| Boiling point | 4743.85 °C | 3126.85 °C |
| Discovery year | 1801 | 1944 |