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Interhalogens Defined

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An interhalogen is a compound of two different halogens, typically one atom of a heavier halogen bonded to an odd number of lighter atoms.

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Iodine pentafluoride, IF5, pairs one heavier iodine atom with five lighter fluorine atoms.

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Interhalogens differ from halide salts formed with metals — both halogen atoms here are nonmetals bonded covalently to each other.

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