Basis for the Derivation of Walshs Rules

Basis for the Derivation of Walsh s Rules.—As already remarked (see also ref. 52), Walsh s rules governing molecular shapes were based, at least implicitly, on the assumption that the total energy was the sum of orbital energies. Though this 

52 Coulson s Valence , ed. R. McWeeny, Oxford University Press, 1979, p. 263. 

In connection with changes in molecular configuration from equilibrium, this is the natural point at which to say something, briefly, about the use of the density description for molecular vibrations. 

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