Halogen

usgb/ˈhælədʒən/
noun

A type of chemical element that includes fluorine, chlorine, bromine, iodine, and astatine.

Chlorine is a type of halogen.
Visual representation of "halogen" - A type of chemical element that includes fluorine, chlorine, bromine, iodine, and astatine.

Often appears as...

  • halogen element
  • halogen lamp

Usage tips

Technical

Definition 1 of 2
Visual representation of "halogen"
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Chemical group

Halogen refers to a group in the periodic table, not a single element.

Illustration for Chemical group
Fluorine and iodine belong to the halogen group.
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Reactivity context

Halogen elements are highly reactive, often discussed in chemistry reactions.

Illustration for Reactivity context
The reactivity of halogens decreases down the group.
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Common salts

Halogen elements combine with metals to form salts, like table salt.

Illustration for Common salts
Sodium chloride is a salt formed with the halogen chlorine.
Visual representation of the word "Halogen"

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