What is the formula for iron (III) oxide?


  • 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.

  • Now you must balance the atomic charges. To do that, you want the charges of the iron and the oxygen to cancel.
    So, for iron, you multiply its charge of +3 by 2 to get +6 You are taking 2 atoms of iron(III) (or iron atoms with a charge of +3) so it is written as ##Fe_2##.
    For oxygen, you multiply -2 by 3 to get -6. You have 3 oxygen atoms with a charge of -2, so the answer is ##Fe_2O_3##.
    Check your work by adding up the charges.
    -6+6=0, which works since you get a net charge of 0

Check this video out!

– 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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