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Yes, there are a few exceptions to the octet rule. This includes molecules with an odd number of electrons (ex. nitrogen), molecules with atoms that have more than 8 electrons (ex. sulfur), and molecules with atoms that have less than 8 electrons (ex. boron).
As long as you follow the octet rule (besides any exceptions), then it wouldn't matter where the additional electron is since you'll have satisfied the octet rule for every atom. For your example of BrO-, just make sure that you have the right amount of electrons. So, count out the valence electrons for each and then add the additional electron for the net negative charge. Adding those up should get you the total needed in order to satisfy the octet rule and complete the Lewis structure.
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