9. What occurs when an electron moves from high-energy level to a low one?
A. The atom moves faster
C. This process is not possible
B. Colored light is given off
D. Another electron goes from a low energy level to a high one
10. Based on Rutherford's atomic model, which sub-atomic particle is present in the nucleus of an atom?
A Proton only
B. Proton and Neutron
C. Neutron and Electron
D Proton and Electron​