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Description of his model: Bohrâs atom like Rutherfordâs contained a dense, positive nucleus. He expanded on Rutherfordâs ideas, turning his attention to describing the electron. He stated they moved in fixed, circular orbits (or energy levels) around the nucleus, these called electron shells.
Share. By Anne Marie Helmenstine, Ph.D. Orbital Definition: Electron cloud having an energy state described by given values of the n, â, and m â quantum numbers. An orbital can contain two electrons with paired spins and is often associated with a specific region of an atom.xamples: The electrons in the 2p x orbital of an atom are generally found within a dumbbell-shaped cloud about the x-axis. Return to the Chemistry Glossary Index.