| Attribute | Value |
|---|---|
| Symbol | Cl |
| Standard state | Gas |
| Atomic mass | 35.45 u |
| Electron configuration | [Ne]3s²3p⁵ |
| Oxidation states |
|
| Electronegativity (pauling scale) | 3.16 |
| Atomic radius (van der waals) | 175 pm |
| Ionization energy | 12.968 eV |
| Electron affinity | 3.617 eV |
| Melting point | 171.65 K |
| Boiling point | 239.11 K |
| Density | 0.003214 g/cm³ |
| Atomic number | 17 |
| Group name | Halogen |
| Discovered | 1774 year |