Editing VSEPR theory (section)

===Some AX<sub>2</sub>E<sub>2</sub> molecules===
One example of the AX<sub>2</sub>E<sub>2</sub> geometry is molecular [[lithium oxide]], Li<sub>2</sub>O, a linear rather than bent structure, which is ascribed to its bonds being essentially ionic and the strong lithium-lithium repulsion that results.<ref>{{cite journal | last1 = Bellert | first1 = D. | last2 = Breckenridge | first2 = W. H. | year = 2001 | title = A spectroscopic determination of the bond length of the LiOLi molecule: Strong ionic bonding | journal = [[J. Chem. Phys.]] | volume = 114 | issue = 7| page = 2871 | doi = 10.1063/1.1349424 | bibcode = 2001JChPh.114.2871B }}</ref> Another example is O(SiH<sub>3</sub>)<sub>2</sub> with an Si–O–Si angle of 144.1°, which compares to the angles in Cl<sub>2</sub>O (110.9°), (CH<sub>3</sub>)<sub>2</sub>O (111.7°), and N(CH<sub>3</sub>)<sub>3</sub> (110.9°).<ref name="Gillespie&Robinson"/> Gillespie and Robinson rationalize the Si–O–Si bond angle based on the observed ability of a ligand's lone pair to most greatly repel other electron pairs when the ligand electronegativity is greater than or equal to that of the central atom.<ref name = "Gillespie&Robinson">{{cite journal | last1 = Gillespie | first1 = R. J. | last2 = Robinson | first2 = E. A. | year = 2005 | title = Models of molecular geometry | journal = [[Chem. Soc. Rev.]] | volume = 34 | issue = 5| pages = 396–407 | doi = 10.1039/b405359c | pmid = 15852152 }}</ref> In O(SiH<sub>3</sub>)<sub>2</sub>, the central atom is more electronegative, and the lone pairs are less localized and more weakly repulsive.  The larger Si–O–Si bond angle results from this and strong ligand-ligand repulsion by the relatively large -SiH<sub>3</sub> ligand.<ref name="Gillespie&Robinson"/>  Burford et al. showed through X-ray diffraction studies that Cl<sub>3</sub>Al–O–PCl<sub>3</sub> has a linear Al–O–P bond angle and is therefore a non-VSEPR molecule.<ref>{{cite journal |last1=Burford |first1=Neil |last2=Phillips |first2=Andrew |last3=Schurko |first3=Robert |last4=Wasylishen |first4=Roderick |last5=Richardson |first5=John |title=Isolation and comprehensive solid state characterization of Cl<sub>3</sub>Al–O–PCl<sub>3</sub> |journal=Chemical Communications |date=1997 |volume=1997 |issue=24 |pages=2363–2364 |doi=10.1039/A705781D |url=https://doi.org/10.1039/A705781D |access-date=3 April 2024|url-access=subscription }}</ref>