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Electron Configuration

The following rules of Bohr and Bury Scheme specify the distribution of electrons in various orbits. The shells are lettered from the innermost to outwards from K to Q.

  1. The maximum number of electrons that can occupy a given orbit is given by a formula 2n2, where n = orbit number.

    For example 3rd shell ‘M’ can occupy

    = 2 x n2

    = 2 x 32

              = 18 electrons

  2. The outermost orbit can have maximum 8 electrons, and the next inner to the outermost (penultimate) can have maximum 18 electrons, (if permissible, in accordance with rule 1).
  3. It is not always necessary to fill up an orbit completely before starting the next higher orbit.

ATOM SHELL STRUCTURE

 

ELECTRON CONFIGURATION TABLE