What evidence do scientists have that electrons can move move from one energy level to another?

Light. When an electron falls to a lower orbit it gives off energy as a photon. Spectral lines give evidence of electrons moving from one energy level to another within the atom.

the atmospheric gas that forms a mild acid when dissolved in water is called carbon dioxide. the correct answer is a. 2.) chemical weathering would cause an inscription on a marble headstone to become harder and harder to read over time.