The oxidation number of halogens is always -1 except when with other halogens or with oxygen.
However, the oxidation number of fluorine will always be -1 no matter what it is in a compound with.
Halogens are all potentially oxidizing agents.
Fluorine is such a powerful oxidising agent that you can't reasonably do solution reactions with it.
Oxidizing ability decreases as you go down the group.
http://www.chemistry.co.nz/redox_oxi_aa.htm
http://www.chemguide.co.uk/inorganic/group7/halogensasoas.html
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