VSEPR: The Basic Molecular Configurations
In each of the generic models in the Molecular Geometry column below, lone pairs are simulated as white balls. The use of white for lone pairs allows the user to use the "Options> Display Hydrogens" menu option (right-click on a Windows computer, or click-hold on a Macintosh) to hide or show the lone pairs. In this column, in order to show the comparison among different shapes, a consistent color pattern is used throughout. In the "Example" molecules, no lone pairs are shown. Any white balls in the "Example" molecules are actual hydrogen atoms.
Total Electron Pairs Electron-Pair Geometry Bonding Pairs Nonbonding Pairs Molecular Geometry Example
2 Linear 2 0
Linear
CO2
3 Trigonal Planar 3 0
Trigonal Planar
BF3
3 Trigonal Planar 2 1
Bent
NO2-
4 Tetrahedral 4 0
Tetrahedral
CH4
4 Tetrahedral 3 1
Trigonal Pyramidal
NH3
4 Tetrahedral 2 2
Bent
H2O
5 Trigonal Bipyramidal 5 0
Trigonal Bipyramidal
PCl5
5 Trigonal Bipyramidal 4 1
Seesaw
SF4
5 Trigonal Bipyramidal 3 2
T-shaped
ClF3
5 Trigonal Bipyramidal 2 3
Linear
XeF2
6 Octahedral 6 0
Octahedral
SF6
6 Octahedral 5 1
Square Pyramidal
BrF5
6 Octahedral 4 2
Square Planar
XeF4