Chlorine |
| Symbol | Cl |
|---|---|
| Latin name | Chlorum |
| Atomic number | 17 |
| Period | 3 |
| Element category | Halogens |
| Relative atomic mass | 35.4527 |
| Group | VII.A |
| Electronegativity | 3.0 |
| Oxidation numbers | -1, 1, 3, 4, 5, 6, 7 |
| Electron configuration | 1s2 2s2 2p6 3s2 3p5 |
| Density [g/cm3] | 0.003214 |
| State | Gas |
| Melting point [°C] | -100.98 |
| Boiling point [°C] | -34.6 |
| Critical point [°C] | 143.75 |
| Critical pressure [MPa] | 7.991 |
| Atomic radius [pm] | 42 |
| Covalent radius [pm] | 71 |
| Thermal conductivity [W m-1K-1] | 0.0089 |
| Heat capacity [J K-1g-1] | 0.48 |
| Discovery | 1774 |
| 1.st ionization energy [eV] | 12.9676 |
| 2.nd ionization energy [eV] | 23.81 |
| 3.rd ionization energy [eV] | 39.611 |
| Stable isotopes | 2 |
| Unstable isotopes | 9 |