Chlorine is a halogen from the periodic table. It is a greenish-yellow gas that has a strong odor and reacts quickly with water. Chlorine is used in many industrial processes, including the production of bleach and other chemicals. It is also used in water treatment and sanitation.
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| Atomic number | 17 |
| Group | VIIA |
| Period | 3 |
| Mass | 35.453 |
| Latin name | Chlorum |
| Electron configuration | [Ne]3s2 3p5 |
| Oxidation state | -1, 0, 1, 2, 3, 4, 5, 6, 7 |