Nickel vs Selenium
| Property | Ni Nickel | Se Selenium |
|---|---|---|
| Atomic number | 28 | 34 |
| Symbol | Ni | Se |
| Name | Nickel | Selenium |
| Category | transition-metal | nonmetal |
| Standard Atomic Weight | 58.6934 u | 78.971 u |
| Period | 4 | 4 |
| Group | 10 | 16 |
| Block | s | p |
| Phase at STP | solid | solid |
| Electron configuration | [Ar]4s23d8 | [Ar]4s23d104p4 |
| Oxidation states | [-2, -1, 0, 1, 2, 3, 4] | [-2, -1, 0, 1, 2, 3, 4, 5, 6] |
| Electronegativity (Pauling) | 1.91 | 2.55 |
| Electron affinity | 1.156 eV | 2.0206 eV |
| Density | 8912 kg/m³ | 4809 kg/m³ |
| Melting point | 1454.85 °C | 220.5 °C |
| Boiling point | 2912.85 °C | 684.85 °C |
| Discovery year | 1751 | 1817 |