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Professor Lavelle said it's not necessary to memorize things like this. Rather we should feel comfortable figuring out the charges by using the periodic table. If you feel more comfortable memorizing them, more power to you! :)
Normally for transition metals, you just have to look at the total charge of the anion and balance it out. For instance, le'ts look at Copper (II) Oxide. We know that the oxygen anion has a -2 charge, so in order to balance that out, Copper has to have a +2 charge.
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