##Fe_2O_3##
You have to balance the atoms first with their charges. Iron or Fe is a transition metal. Transition metals as a whole group do not have a specific charge. Iron has different charges but in this case, it’s charge is +3.
Oxygen has a charge of -2 since it is in column 16, shown in the table.
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NOTE
– When I say charge, each element has a certain number of (electrons in their outer shell). So, if you are in Group 1 (the alkali metals), you would have a +1 charge.
– Your charge is based on columns or families (horizontal!). This is shown in the picture
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