chem help

How do I find charges for ions of elements. Group 1 has 1+ charges, group 2 has a 2+ charge and so on...what about the exceptions? In can have a 3+ or a 1+ how am I supposed to figure that out?

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  1. see the short paragraph and visual titled

    Predicting ion charges.

    http://antoine.frostburg.edu/chem/senese/101/atoms/

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    bobpursley

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