Chlorine vs Bromine
| Property | Cl Chlorine | Br Bromine |
|---|---|---|
| Atomic number | 17 | 35 |
| Symbol | Cl | Br |
| Name | Chlorine | Bromine |
| Category | halogen | halogen |
| Standard Atomic Weight | 35.4515 u | 79.904 u |
| Period | 3 | 4 |
| Group | 17 | 17 |
| Block | p | p |
| Phase at STP | gas | liquid |
| Electron configuration | [Ne]3s23p5 | [Ar]4s23d104p5 |
| Oxidation states | [-1, 1, 2, 3, 4, 5, 6, 7] | [-1, 1, 2, 3, 4, 5, 7] |
| Electronegativity (Pauling) | 3.16 | 2.96 |
| Electron affinity | 3.6127 eV | 3.3635 eV |
| Density | 3.214 kg/m³ | 3102.8 kg/m³ |
| Melting point | -101.5 °C | -7.2 °C |
| Boiling point | -34.04 °C | 58.8 °C |
| Discovery year | 1774 | 1825 |