The valence connection index δ v is not suitable for the inorganic compounds which have complicated oxidation state (for example,Si +,Si 2+ ,Si 3+ ,Si 4+ ) and the organic compounds which include many sorts of heteroatoms such as F,Cl,Br,I,O,S,etc.,in order to enlarge the field of δ v ,on the basis of δ v ,we defined the valence connection index δ - i by introducing the main quantum number,the number of valence electrons to the atom under study.The improved molecular topologic...
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