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I always start by counting the number of electrons that I have to work with. For ICL2+, I counted 20 electrons, and since I is less electronegative than Cl, I placed it as the central atom. Then it comes down to placing the single bonds in and determining where the lone pairs go. For ICl2+, I got 2 bonding and 2 lone pairs for I. Since we know that Cl is more electronegative, we can assume that there won't be double bonds on these structures. You can just use this process of arranging the bonds and electrons to get the structures--while keeping formal charge in mind.
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