4. Which particle controls what element an atom is? Describe how you used the model to come up with your answer.
5. What do you get when you change the number of neutrons in the nucleus?
6. What controls the "weight" of an atom? Describe how you used the model to come up with your answer.
7. Try to cluster the electrons together or move them into another level. Describe the behavior of the model electrons.
8. What do you get if the number of protons and electrons in your model is not equal?