Bohr Radius

The distance corresponding the mean distance of an electron from the nucleus in the ground state of the hydrogen atom.
a0 = 5.291772x10-11 m

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


where
ν = frequency of the elecromagnetic radiation [Hz]
Ei, Ef = energy of electron in orbits i, f [J]
h = Planck′s constant [Js]

See also: Bohr Atom, Physical Constants.

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Subjects: Physics