Zirconium vs Niobium
| Property | Zr Zirconium | Nb Niobium |
|---|---|---|
| Atomic number | 40 | 41 |
| Symbol | Zr | Nb |
| Name | Zirconium | Niobium |
| Category | transition-metal | transition-metal |
| Standard Atomic Weight | 91.224 u | 92.90637 u |
| Period | 5 | 5 |
| Group | 4 | 5 |
| Block | s | s |
| Phase at STP | solid | solid |
| Electron configuration | [Kr]5s24d2 | [Kr]5s14d4 |
| Oxidation states | [1, 2, 3, 4] | [-3, -1, 0, 1, 2, 3, 4, 5] |
| Electronegativity (Pauling) | 1.33 | 1.6 |
| Electron affinity | 0.426 eV | 0.893 eV |
| Density | 6520 kg/m³ | 8570 kg/m³ |
| Melting point | 1854.85 °C | 2476.85 °C |
| Boiling point | 4408.85 °C | 4743.85 °C |
| Discovery year | 1789 | 1801 |