In doing this, the more reactive halogen is reduced to a halide ion, and the halide ion is oxidised to a halogen, so these are also redox reactions. A more reactive halogen atom can remove an electron from a halide ion of a less reactive halogen. These displacement reactions demonstrate the decreasing reactivity down Group 17. Reactions of Group 7 i) Displacement reaction between halogens and halide ions This happens in interhalogens such as ICl 3 and in ions such as chlorate, bromate and iodate ions: e.g. While they normally have a valency of 1, we do see halogens in Period 3 or below forming more than one single covalent bond. The compounds of halogens include the interhalogens, simple molecules such as ICl, IBr, ICl 3 as well as the more familiar HBr, HCl etc. Halogens will also react by sharing an electron to form (single) covalent bonds. Since the halogens get less reactive down the group, they are less effective at oxidising other substances, and hence their oxidising power decreases down the group.
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