Flexi Says: In Bohr’s atomic model, electrons move around the nucleus only at fixed distances from the nucleus based on the amount of energy they have. The fixed distances where electrons may orbit are called energy levels. Bohr arrived at his model by applying Planck’s idea of energy quanta to Rutherford’s atomic model of electrons orbiting the nucleus. A quantum (plural, quanta) is the minimum amount of energy that can be absorbed or released by matter. It is a discrete, or distinct, amount of energy.