The halogens are in group 7 of the periodic table devised by Dimitri Mendeleev and have 7 electrons in their outer shell. The name halogen originates from the Greek for salt makers and is one of the more reactive non-metal groups. All of the halogens exist as diatomic molecules when elements with one covelant bond between the molecules. All halogens displace each other when they are more reactive (have a stronger electronegativity). For example:
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