General Chemistry Resources
Dr. Scott Ensign
EnsignChemistry.com

Electron-domain geometries, molecular geometries, and orbital hybridizations for a central atom containing two, three, four, five, or six electron domains.

"A" represents the central atom, "X" represents a bonded domain (note there may be one, two, or three electron pairs between A and X), and "E" represents a nonbonding electron domain (a lone pair).

total e-
domains
bonded
domains (X)

nonbonded
domains (E)
e- domain
geometry
Molecular geometry

formula

Orbital hybridization example(s) Bond angles 3-D representation(s) (click on the figure(s) to view and manipulate structures using Jmol)
2 2 0

linear

linear

AX2 sp

BeH2,CO2, C2H2

180

2 1 1 linear linear AXE sp CO, N2 N/A
3 3 0 trigonal planar trigonal planar AX3

sp2 BH3 120
3 2 1 trigonal planar bent AX2E sp2 SO2 119
4 4 0 tetrahedral tetrahedral

AX4

sp3

CH4

109.5
4 3 1 tetrahedral trigonal pyramidal AX3E sp3 NH3 107
4 2 2 tetrahedral bent AX2E2 sp3 H2O 104
5 5 0 trigonal bipyramidal trigonal bipyramidal AX5 sp3d PF5 120 and 90
5 4 1 trigonal bipyramidal see saw AX4E sp3d SF4  
5 3 2 trigonal bipyramidal T shaped AX3E2 sp3d ClF3  
5 2 3 trigonal bipyramidal linear AX2E3 sp3d XeF2  
6 6 0 octahedral octahedral AX6 sp3d2 SF6 180 and 90
6 5 1 octahedral square pyramidal AX5E sp3d2 IF5  
6 4 2 octahedral square planar AX4E2 sp3d2 XeF4 90
                   
                   

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