This worksheet guides the student through 4 of the most important experiments which led to the discovery of Atomic Structure: 1. Cathode Ray 2. Oil Drop 3. Gold Foil and 4. Chadwick's discovery of the Neutron. It is loaded with memorable diagrams which took hours to produce. Best of all, this exercise is modeled to follow youtube sensation Tyler Dewitt's series "Structure of the Atom: History and Experiments". So, you can play each Tyler Dewitt experiment and let the Students fill in the blanks ~ in other words you can take a break and let Tyler Dewitt take over for a few days;) A key is included. Enjoy!