These high school chemistry worksheets are full of pictures, diagrams, and deeper questions covering atoms versus ions, isotopes, the history of the atom (Dalton, Rutherford, Bohr), calculating atomic mass from isotope data, reading chemical symbols, types of radioactive decay, balancing nuclear equations, and more advanced topics like quarks and other small subatomic particles! This unit is designed to help students build up the basic vocabulary they will use all year to help them describe che