Halogen
/ˈhælədʒən/
Definition 1 of 2
Pro Tip 1/3Chemical group
Halogen refers to a group in the periodic table, not a single element. 
Fluorine and iodine belong to the halogen group.
Pro Tip 2/3Reactivity context
Halogen elements are highly reactive, often discussed in chemistry reactions. 
The reactivity of halogens decreases down the group.
Pro Tip 3/3Common salts
Halogen elements combine with metals to form salts, like table salt. 
Sodium chloride is a salt formed with the halogen chlorine.
Compare with
BromineChlorineFluorineIodine
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