Answer:
Models are used to study atoms because we can never really see an atom up close, and a model is like a super magnified version of the atom. Plus, its easier to study from them because we can pin point the different characteristics of the atom (Protons, Neutrons, etc.)
Explanation:
Hope this helps! :>
Answer:
I believe its because the molecules are to small to see with the human eye and because the process would be very dangerous and somebody could get hurt.