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The best way to think about the problems such as this is to first how many electrons there are in the equations(valence electrons). Then put the element with the least electronegativity in the center and everything else in the outside. give everything an octet just by standard rule. After make sure that the number of electrons you added matches up with how much there is supposed to be. After check the charge on each element to make sure that there is the least amount of charge possible and if not, manipulate it so that you fixed it. So when doing BF3, if you follow these steps it should be easier to visualize. Hope this helps!
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