Selenium vs Bromine
| Property | Se Selenium | Br Bromine |
|---|---|---|
| Atomic number | 34 | 35 |
| Symbol | Se | Br |
| Name | Selenium | Bromine |
| Category | nonmetal | halogen |
| Standard Atomic Weight | 78.971 u | 79.904 u |
| Period | 4 | 4 |
| Group | 16 | 17 |
| Block | p | p |
| Phase at STP | solid | liquid |
| Electron configuration | [Ar]4s23d104p4 | [Ar]4s23d104p5 |
| Oxidation states | [-2, -1, 0, 1, 2, 3, 4, 5, 6] | [-1, 1, 2, 3, 4, 5, 7] |
| Electronegativity (Pauling) | 2.55 | 2.96 |
| Electron affinity | 2.0206 eV | 3.3635 eV |
| Density | 4809 kg/m³ | 3102.8 kg/m³ |
| Melting point | 220.5 °C | -7.2 °C |
| Boiling point | 684.85 °C | 58.8 °C |
| Discovery year | 1817 | 1825 |