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The quantitative
G.N.Lewis Model

  Ernst Schumacher, University of Bern
  Prof.em of Chemistry, Dep. Chemistry
  and Biochemistry

  This site presents a quantitative
  Lewis model
of molecular structure,
  using G.E. Kimball's free [spherical
  electron probability] clouds

  Note: Drawings of "electron clouds" or
  "orbitals" on a molecular skeleton in
  any approximation represent helpful
  visualizations, not the "truth"! The   same holds for the not existing   "bonding sticks" and the arbitrary   cores.

  Gallery of examples

Orbital surfaces are the set of points at a selected amplitude of the spatial wavefunction φ, which is unlimited. Computed by Gaussian03™, drawn by WebMO™. Cores are arbitrary. ⟨φ|φ⟩ would show density surfaces (like those at right) of similar shape.

Kimball's free clouds are simple computa-tional tools, explained in these pages. Their surface is the set of points at the expected radius ⟨φ|r|φ⟩ of an unlimited s-type density distribution for every sphere (Tutorials). [He] cores are computed, too. Program from ES with Mathematica™.

Both charge distributions give nearly the same Vee, Vne.

11. April 2009, 21:20:32