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How does the electropositivity vary down...

How does the electropositivity vary down the group of halogens? 

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All halogens are non-metals.
Electropositivity increases down the group.
Fluorine does not exhibit positive oxidation states. Chlorine, bromine and iodine exhibit positive oxidation states. However, only iodine is known to form cation. It with reasonable stability  .
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