Review of known facts regarding the atom as modeled by Niels Bohr... Discussion of what determines the energy of the atom, and how the orbital radius affects the potential energy, which affects the total energy of the atom... How an atom becomes "excited" and why it emits an electromagnetic wave of energy when an electron drops from a higher to lower energy level... Show how energy and orbit size are quantized and derive the formula to show that the energy of the atom = the energy of the photon.