This answer is not correct. You seem to have remembered the ionic charges of +3 and -2 but have mixed them up. Aluminum has 3 outer shell electrons and readily loses these electrons to become a cation with a charge of positive 3. Sulfur has 6 outer shell electrons and tends to gain two electrons to form a sulfide anion with a charge of negative 2. Remember that elements in columns 1,2 and 3 of the periodic table will tend to lose their outer electrons to become cations with inert gas electron configurations. Elements in columns 5,6 and 7 tend to gain enough electrons to become anions with inert gas electron configurations.