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There's a list of ions under Naming Coordination Compounds on the 14A website. I don't necessarily think you should memorize them all but just being familiar with them is good. We've discussed most of them in class at length already (CN-, SO4^2-, etc.)
It would also be helpful if you could figure out the other polyatomic charges through the ones you already know. For example in [Co(NH3)4(OH2)2]Br3, if you knew that the charge of NH3 and OH2 (or H20) was 0, you could figure out that the charge of Co is +3.
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