Bohr found that electrons can occupy those orbits where the angular momentum of a moving electron is an integral multiple of h÷2π where h is Planck’s constant and is given by the equation: The electrons revolve only in certain non-radiating orbits called stationary orbits.Electrons move around the nucleus in some circular orbits. An atom consists of a nucleus, which contains protons and neutrons, and hence, most of the mass and positive charge is concentrated there.Bohr used Planck’s quantization of energy concept in his theory called Bohr’s theory.īohr made the following assumptions in his theory: Bohr suggested that if we make certain assumptions, the puzzle of the hydrogen spectra may be solved. The Bohr atomic model modified the older Rutherford model, so it is also called the Rutherford–Bohr model. To include the quantum theory, Niels Bohr proposed his own model for the structure of the atom called Bohr’s model. Although useful, it was partly inaccurate as it did not incorporate the quantum theory and could not explain why atoms produced discrete spectral lines. One of the earliest models of the atom was the planetary model, as proposed by Rutherford.

When Bohr was working in England in 1913, he established this atomic model. In 1912, Bohr joined Ernest Rutherford’s group, which was at Manchester, England, where he began to work on the atomic theory. Niels Henrik David Bohr, a great name in physics, was the first one who explained quantitatively the general features of the structure of hydrogen atoms and their spectrum.

Bohr atomic models worksheet