Nonbonding Interactions in Valence Bond Theory

Since the A B — C structure displays a singlet coupling between orbitals b and c, Equation 3.50 gives its wave function  

Since there are two covalent bonds (each accounting for 2(35) and one nonbonded repulsive interaction (—(35) in this VB structure, its energy simply expresses a balance between the two corresponding energy quantities, namely  

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