Molecular graphs of , and (n = 6–9) clusters from the density and the molecular electrostatic potential

A comparative analysis of molecular graphs of the electronic density and the molecular electrostatic potential (MEP) for lithium, sodium and copper clusters with up to nine atoms is presented. Whereas the density molecular graphs are qualitatively different for these clusters the corresponding MEP molecular graphs are surprisingly similar. Only for copper clusters MEP and density molecular graphs are similar. Our analysis indicates that MEP molecular graphs for these metal clusters show connectivities very much in the spirit of Lewis structures.