Why does this criss cross method give is a valid formula for an ionic compound?

The criss cross method helps determine the correct subscripts for ions in an ionic compound by ensuring that the charges balance out to zero. This method works because the total positive charge from the cation(s) must equal the total negative charge from the anion(s) to form a neutral compound. By swapping the numerical values of the charges on each ion to serve as subscripts in the compound formula, this balance is achieved.