Chemistry / Chem 2349 · Atom · ~20 seconds
Halogen Oxidizing Strength Decreases Down the Group
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Halogen oxidizing strength decreases down the group as electronegativity falls, so fluorine is the strongest halogen oxidizer and iodine the weakest.
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Chlorine oxidizes bromide ion to elemental bromine, but iodine cannot oxidize any of the halide ions above it.
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A weaker halogen oxidizer is not a nonoxidizer — iodine still oxidizes many metals, less readily than lighter neighbors.