Chlorine
Halogen| Atomic number | 17 |
|---|---|
| Category | Halogen |
| Atomic mass | 35.45 |
| Electron configuration | [Ne]3s² 3p⁵ |
| Oxidation states | −1 … +7 |
| Electronegativity | 3.16 |
| Melting point | -101.5 °C |
| Boiling point | -34 °C |
| Density | 0.003 g/cm³ |
| Crystal structure | Orthorhombic (solid) |
| Group | 17 |
| Period | 3 |
| Block | p |
| Discovered | 1,774 |
| Crustal abundance | 145 ppm |