I use this activity with my chemistry students after I have taught about ions and isotopes to help them practice determining mass number, atomic number, protons, electrons, neutrons, and charge. This worksheet also covers nuclear symbols and isotope naming. I have also included an answer key for you to use. I find that this is great practice for my students, and it is one that my students tend to ask if I have other versions with which they can practice. I have made it editable so that you can m