17Cl35.45
Chlorine (Cl)
Element 17 Ā· Halogen
Chlorine (Cl) is a chemical element with atomic number 17. It is classified as a halogen in period 3, group 17 of the periodic table (the p-block). Its standard atomic weight is 35.45 u and its ground-state electron configuration is [Ne] 3sĀ² 3pāµ.
Chlorine facts
| Atomic number (Z) | 17 |
|---|---|
| Symbol | Cl |
| Standard atomic weight | 35.45 u |
| Category | Halogen |
| Group | 17 |
| Period | 3 |
| Block | p-block |
| Electron configuration | [Ne] 3sĀ² 3pāµ |
| Electronegativity (Pauling) | 3.16 |
| State at 20 Ā°C | Gas |
| Protons / electrons | 17 / 17 |
| Neutrons (most common isotope, approx.) | 18 |
| Molar mass | 35.45 g/mol |