Where do Electrons escape from ?
SF6 , for the central S neutral counting : S contributes 6 electrons , each fluorine radical contributes one each : 6 +6 (1) = 12 valence electrons ionic counting : S6 + contributes 0 electrons , each fluoride anion contributes 2 : 0 +6 (2) = 12 valence electrons conclusion : ionic counting indicates a molecule lacking lone pairs of electrons , therefore its structure will be octahedral , as predicted by VSEPR .