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 (click to view and manipulate structures) | Orbital hybridization | example(s) | Bond angles | 3-D representation (click to view and manipulate structures) |
|---|---|---|---|---|---|---|---|---|---|
| 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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