How Many Protons, Neutrons, and Electrons Are in the Anion

Multiple Choice

How many protons, neutrons, and electrons are in the anion of the compound, CrCl₃³⁷?

A) 17 protons, 20 neutrons, and 18 electrons
B) 18 protons, 23 neutrons, and 21 electrons
C) 21 protons, 21 neutrons, and 16 electrons
D) 14 protons, 23 neutrons, and 17 electrons
E) 17 protons, 17 neutrons, and 20 electrons