These easy to understand charts will allow students to practice finding proton, neutron and electron number of atoms. Many of the atoms included in these worksheets are not the most common isotope found on the periodic table. There are 3 different charts included, and each has their own answer key. There are color and black and white versions of each chart. In my class, I use one version for practice, and the other 2 as quizzes. The worksheets are full size, but can be shrunk down during photocopying to be used in interactive notebooks.