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On my periodic table, there are multiple ionic charges listed for some elements. I assume this is because there are multiple possible ions. However, I have a homework question that asks for the ionic charge of an atom, and does not give a number of electrons. For example, a Sulfur ion: On my periodic table, it lists the charges 6, + or - 2, and 4. Are they all equally possible, or is there a "right" answer? If the latter, how do I know?Thanks!