In writing Lewis structures, we place the least electronegative element in the center because it can better share its electrons and form bonds than more electronegative elements.
Iodine (EN = 2.66) is less electronegative than fluorine (EN = 3.98) so iodine goes in the center of the Lewis structure. Since iodine belongs to Period 5, we can use an expanded octet to accommodate more F atoms in the molecule.
The Lewis structure for IF4+ is:
Predict the shape, state the hybridization of the central atom, and give the ideal bond angle(s) and any expected deviations for IF4+.
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