Answer
-2
Work Step by Step
The problem tells us that an ion has a charge of the sum of its protons and electrons. It tells us the proton charge is +1, and that the electron charge is -1. Since we have 18 electrons, we have a total of 18 -1 charges, which is 18*(-1). Since we have 16 protons, we have a total of 16 +1 charges, which is 16*1. Adding these together, we get (18*(-1)+16*1) = -18+16 = -2. So, the charge of the sulfur ion is -2.
