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For the Lewis structure for iodate, the solutions manual gives it to be central atom I with with 3 single bonds connected to the 3 O. Based off formal charge, wouldn't we rather have 3 double bonds to connect the 3 O and then just leave the FC on the central I to be -1?
Adding onto the previous answer, a lewis structure with two double bonded and one single bonded oxygen would allow iodine and two oxygens to have a formal charge of 0 and one oxygen to have a formal charge of -1. This makes sense since oxygen is more electronegative than iodine and will have a slightly stronger pull on the electron than iodine, making it more likely to have a negative charge than iodine.
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