Function VSEPR-like

Wannier functions whilst chemists should remember VSEPR-like functions containing electron pairs), but a more direct way of bypassing the standard (delocalized) route is needed. 

The electron localization function (ELF) is another tool that has been used with considerable success in highlighting domains in p(r) of strong electron localization (Becke and Edgecombe 1990). These domains, like those defined by the maxima in VSCC, have likewise been associated with the bonding and nonbonding electron-pairs of the VSEPR model (Becke and Edgecombe 1990 Bader et al. 1996 Bader et al. 1996 Savin et al. 1997). The ELF has also been found to reveal the shell structure of an atom in a clear and faithful fashion. 

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