Final answer:
Niels Bohr proposed a revolutionary model of the atom that explained electron behavior using the idea of specific orbits and quantized energy levels. This model provided an explanation for the emission of energy in the form of photons when electrons move between orbits.
Step-by-step explanation:
Bohr's model of the hydrogen atom, proposed by Niels Bohr in 1913, was the first quantum model that correctly explained the hydrogen emission spectrum. Bohr's model combines the classical mechanics of planetary motion with the quantum concept of photons. He suggested that electrons move in specific orbits around the nucleus, where they do not radiate energy. This was revolutionary because it introduced the idea of quantized or discrete energies for electrons, and it explained the emission of specific amounts of energy in the form of photons when electrons move between orbits.