Cl
Chlorine Symbol (Cl)
Chlorine is element 17 of the periodic table. Copy its symbol Cl and see its atomic weight, electron configuration and common compounds.
What does Cl mean?
Cl is the chemical symbol for chlorine, element number 17 in the periodic table. Chlorine is a halogen in group 17, period 3. It is a toxic yellow-green gas used to disinfect drinking water and make PVC.
Codes and properties
| Chemical symbol | Cl |
|---|---|
| Atomic number (Z) | 17 |
| Standard atomic weight | 35.45 |
| Group / period | 17 / 3 |
| Element category | halogen |
| Electron configuration | 1s² 2s² 2p⁶ 3s² 3p⁵ |
| Common compounds | NaCl, HCl, Cl₂, NaClO |
How to type Cl
- Plain text: type
Cl— element symbols are ordinary Latin letters, with the first letter capitalised and the second lowercase. - Subscripts in formulas: use Unicode subscript digits (₀₁₂₃₄₅₆₇₈₉) for formulas such as NaCl — copy them from the chemistry keyboard.
- LaTeX: write
\mathrm{Cl}in math mode, or use the mhchem package:\ce{Cl}. - HTML:
Cl; for subscripts use<sub>, e.g.H<sub>2</sub>O.
Frequently asked questions
What is the chemical symbol for chlorine?
The chemical symbol for chlorine is Cl.
What is the atomic number of chlorine?
Chlorine has atomic number 17, meaning each atom has 17 protons.
What is the electron configuration of chlorine?
The ground-state electron configuration of chlorine is 1s² 2s² 2p⁶ 3s² 3p⁵.