Elements · ← S Sulfur · Ar Argon →
Cl Chlorine
Basic facts
| Symbol | Cl |
|---|---|
| Atomic number | 17 |
| Standard atomic weight | 35.45 |
| Group | 17 |
| Period | 3 |
| Block | p-block |
| Category | Halogen |
| Standard state | Gas |
| Discovered | 1774 |
Source: PubChem, Chlorine (periodic table data, retrieved 2026-10-19). Group and period follow the standard 18-column periodic table.
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Other entries on the site that mention chlorine
Found by name, common compounds and chemical formulas in each entry.
- A water-rich mineral in Moon soil · Chang'e-5 lunar samples · 2024