Previous Page...   Printer Version Science Constants - Radius, Bohr Symbol: a0 Value: 5.291772083(19) × 10-11 m Category: - General Atomic and Nuclear Constants Description: The Bohr model of atoms states: 1. An electron moves around the nucleus in a circular orbit under the influence of the electrostatic attraction between the electron and the nucleus. 2. The orbit of an electron can only be a multiple of h/2π, where h is Planck's Constant. 3. The total energy of an electron, E, remains constant as the electron does not radiate electromagnetic energy. 4. When an electron moves from an orbit with energy Ei to an orbit with lower energy Ef, electromagnetic radiation is emitted. The frequency of this elecromagnetic radiation is given by v = (Ei - Ef) / h, where h is Planck's Constant.   The Bohr radius is equal to the radius of orbit of the electron of an hydrogen atom when the Bohr model is applied to the atom.   [ H O M E ] [ S C I E N C E ] [ M A T H S ] [ A S T R O N O M Y ] [ Download ] [ Shop ] [ Contact ] [ About ]