338 CHAPTER 8: Molecular Structure and Covalent Bonding Theories
TABLE 8-3 Molecular Geometry of Species with Lone Pairs (U) on the Central AtomRegions
of High
General Electron Electronic Hybridization at Lone
Formula Density Geometry Central Atom Pairs Molecular Geometry ExamplesAB 2 U 3 trigonal sp^2 1O 3 , NO 2 , SO 2
planar
AB 3 U 4 tetrahedral sp^3 1NH 3 , SO 32
AB 2 U 2 4 tetrahedral sp^3 2H 2 O, NH 2
AB 4 U 5 trigonal sp^3 d 1SF 4
bipyramidal
AngularTrigonal
pyramidalAngularSeesaw