Question

Why oxides of halogens with halogen in higher oxidation state are stable?

Answer 1

Because halogen having higher atomic number,greater tendency to lose their outer electron imidiately due to longer distance from nucleus. So that higher halogen are react with oxigen and form oxide and become stable. On the other hand lower halogen are less stable.

Answer 2

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The halogen elements show great resemblances to one another in their general chemical behaviour and in the properties of their compounds with other elements. There is, however, a progressive change in properties from fluorine through chlorine, bromine, and iodine to astatine-the difference between two successive elements being most pronounced with fluorine and chlorine. Fluorine is the most reactive of the halogens and, in fact, of all elements, and it has certain other properties that set it apart from the other halogens.

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