It would be Ruthenium (II) Sulfide Ruthenium is a transition metal, meaning that it can have multiple oxidation numbers. Sulfur always takes the charge of -2, so from that we see that there is a 1 to 1 relation between Ru and S in the empirical formula, so that means that Ruthenium has the opposite charge, +2. Solution It would be Ruthenium (II) Sulfide Ruthenium is a transition metal, meaning that it can have multiple oxidation numbers. Sulfur always takes the charge of -2, so from that we see that there is a 1 to 1 relation between Ru and S in the empirical formula, so that means that Ruthenium has the opposite charge, +2..