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Ionic Charge The charges on positive ions for active metals as well as some negative ions can be deduced immediately from their position in the table. Group 1 +1 Group 2 +2 Group 3 +3 Al only - the others have multiple oxidation states. Group 15 -3 usually only N does this. Group 16 -2 O,S and sometimes Se. Group 17 -1 all halogens.

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