Chapter 2, Problem 2.86E

Which of the following is the chemical symbol for the species that has $16$ protons, $17$ neutrons, and $18$ electrons?

a. ${}_{\text{16}}^{\text{33}}\text{S}$

b. ${}_{\text{17}}^{\text{33}}\text{Cl}$

c. ${}_{\text{17}}^{\text{35}}\text{Cl}$

d. ${}_{\text{16}}^{\text{33}}{\text{S}}^{2-}$