noun
- any of a group of five chemical elements (fluorine, chlorine, bromine, iodine, and astatine) that form salts when combined with metals
Usage: chemistry
Examples
- Chlorine is a halogen commonly used to disinfect swimming pools.
- The halogen elements are found in Group 17 of the periodic table.
- Fluorine is the most reactive halogen.
- Halogen compounds are widely used in industry.
- Iodine is a halogen essential for thyroid function.
- The halogen family includes both gases and solids at room temperature.