Answer KEY Build AN ATOM uywqyyewoiqy ieoyqi eywoiq yoie An atom with 14 protons and 13 neutrons. Isotopes Same Atom, Not Isotopes of Each Other **Different Element ** EXERCISES. The periodic table has a great deal of information about every atom. Using your periodic table, answer the following questions: a) What is the atomic number of chlorine (Cl)? _ 17 _