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Br has 7 valence electrons and O has 6. 7+6=13, add 1 because of the (-) so your total is 14 valence electrons. Br and O share a pair of electrons, so there are 2 dots between Br and O. then there are 2 more dots on each side of Br and O so that the total is 14 dots. Then you put brackets around the whole thing with a negative sign to show it is negative.
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