Editing VSEPR theory (section)

===Some AX<sub>6</sub>E<sub>1</sub> and AX<sub>8</sub>E<sub>1</sub> molecules===
[[File:Xenon-hexafluoride-3D-SF.png|200px|thumb|[[Xenon hexafluoride]], which has a distorted octahedral geometry]]
Some AX<sub>6</sub>E<sub>1</sub> molecules, e.g. [[xenon hexafluoride]] (XeF<sub>6</sub>) and the Te(IV) and Bi(III) anions, {{chem|TeCl|6|2-}}, {{chem|TeBr|6|2-}}, {{chem|BiCl|6|3-}}, {{chem|BiBr|6|3-}} and {{chem|BiI|6|3-}}, are octahedral, rather than pentagonal pyramids, and the lone pair does not affect the geometry to the degree predicted by VSEPR.<ref>{{cite book|last=Wells |first=A. F. |date=1984 |title=Structural Inorganic Chemistry |edition=5th |publisher=Oxford Science Publications |isbn=978-0-19-855370-0}}</ref> Similarly, the octafluoroxenate ion ({{chem|XeF|8|2-}}) in [[nitrosonium octafluoroxenate(VI)]]<ref name=Housecroft/>{{rp|498}}<ref name="Peterson1971">{{Cite journal | first3 = A.| first2 = H. | first4 = M.| title = Antiprismatic Coordination about Xenon: the Structure of Nitrosonium Octafluoroxenate(VI)| first1 = W.| last2 = Holloway| last3 = Coyle| volume = 173| journal = [[Science (journal)|Science]]| issue = 4003| pages = 1238–1239| issn = 0036-8075| doi = 10.1126/science.173.4003.1238| last4 = Williams| pmid = 17775218| last1 = Peterson| date = Sep 1971|bibcode = 1971Sci...173.1238P | s2cid = 22384146 }}</ref><ref>{{cite book| title = Molecular origami: precision scale models from paper| first1 = Robert M.| last1 = Hanson| publisher = University Science Books| year = 1995| isbn = 978-0-935702-30-9}}</ref> is a square antiprism with minimal distortion, despite having a lone pair. One rationalization is that steric crowding of the ligands allows little or no room for the non-bonding lone pair;<ref name = "Gillespie&Robinson"/> another rationalization is the [[inert-pair effect]].<ref name=Housecroft/>{{rp|214}}