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Fluorine exhibits only -1 oxidation stat...

Fluorine exhibits only -1 oxidation state whereas other halogens exhibit +1, +3, +5 and +7 oxidation states also. Explain.

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Fluorine is the most electronegative element and cannot exhibit any positive oxidation state. Other halogens have d-orbitals, and hence, they can expand their octets and show + 1, +3, +5 and + 7 oxidation states also.
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