Abstract
The spectral density operator technique is proved to be a convenient tool for derivation of approximate topological formulae for total pi‐electron energy (Epi) of benzenoid hydrocarbons (BHs). Developed mathematical formalism points out a common origin of three different measures for the stability of BHs, namely: resonance energy (RE), number of Kekule structures (K) and HOMO‐LUMO separation (XHL). In turn, a novel topological invariant corresponding to “normalized” RE is derived. Numerical calculations for a representative set of BHs demonstrate effectiveness of the present approach. Various approaches to an estimation of BH stabilities are discussed.

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