a theory, proposed by Niels Bohr in 1913, stating that electrons revolve in definite orbits around a nucleus, and that radiation is absorbed or emitted only when an electron is transferred from one orbit to another
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An early model of atomic structure, in which electrons circulate around the nucleus in discrete, stable orbits with different energy levels. This model was the first to predict and explain the atomic spectrum of the hydrogen atom, which arises as the electron jumps from one orbit to another orbit of lower energy, giving off electromagnetic radiation of predictable frequencies. Later models of atomic structure abandoned the idea of circular orbits, and explained the stable orbits as standing waves.