By D. H. Rouvray
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A step toward a more detailed consideration of the electronic struc ture of molecules was made by I’ Haya et al. [14, 77] in 1976-77. The elec trons were regarded as distributed into nonvalence (core) and valence types, the latter being divided into a- and 7r-parts. , proceeding from the concept of chemical bonds. r-bonds, the latter are also treated separately. / £ Nil) i=i (21) where TV, is the number o f electrons in the ith partial bond space. Mathemat ical analysis indicates that, for a fixed total number o f electrons, the elec tronic complexity is higher when more valence bonds are formed.