Selenium vs Niobium
| Property | Se Selenium | Nb Niobium |
|---|---|---|
| Atomic number | 34 | 41 |
| Symbol | Se | Nb |
| Name | Selenium | Niobium |
| Category | nonmetal | transition-metal |
| Standard Atomic Weight | 78.971 u | 92.90637 u |
| Period | 4 | 5 |
| Group | 16 | 5 |
| Block | p | s |
| Phase at STP | solid | solid |
| Electron configuration | [Ar]4s23d104p4 | [Kr]5s14d4 |
| Oxidation states | [-2, -1, 0, 1, 2, 3, 4, 5, 6] | [-3, -1, 0, 1, 2, 3, 4, 5] |
| Electronegativity (Pauling) | 2.55 | 1.6 |
| Electron affinity | 2.0206 eV | 0.893 eV |
| Density | 4809 kg/m³ | 8570 kg/m³ |
| Melting point | 220.5 °C | 2476.85 °C |
| Boiling point | 684.85 °C | 4743.85 °C |
| Discovery year | 1817 | 1801 |