Here's why:
* Sulfur (S) has a variable valency, meaning it can form different ions with varying charges. In this case, it's in the +1 oxidation state, as indicated by the Roman numeral "II".
* Chlorine (Cl) typically has a -1 oxidation state.
* To balance the charges, you need two sulfur atoms (+1 each) and two chlorine atoms (-1 each).
Therefore, the formula becomes S2Cl2.
