Select correct option(s) for $\frac{32}{16}{\mathrm{S}}^{-2}$:

The atomic number of ${\mathrm{S}}^{-2}$ is 16. The atomic number is equal to number of neutrons, so the number of neutrons of X is16. Mass number is given as 32. 
Also the total number of electron in X is equal to 18.