Work a lab using the flame tests on a series of ions which demonstrate the wavelength of light energy given off when an electron moves from an excited state to a lower or ground state.
In class, introduce the Bohr atom theory showing the electron energy level(s) for hydrogen. Discuss the equation used to determine the energy in photons emitted by an electron, along with the determination of the frequency. Introduce Bohr's first quantum number, n, to indicate the energy levels,. Discuss why the Bohr theory only holds true for hydrogen.