VSEPR
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VSEPR Geometries
[edit]Valence shell electron pair repulsion (VSEPR) theory (1957) is a model in chemistry, which is used for predicting the shapes of individual molecules, based upon their extent of electron-pair electrostatic repulsion, determined using steric numbers.
2D
[edit]| Steric No. |
Basic Geometry 0 lone pair |
1 lone pair | 2 lone pairs | 3 lone pairs | 4 lone pairs |
|---|---|---|---|---|---|
| 1 |  linear | ||||
| 2 |  linear  linear | ||||
| 3 |  trigonal planar  bent / angular  linear | ||||
| 4 |  tetrahedral  trigonal pyramid  bent / angular  linear | ||||
| 5 |  trigonal bipyramid  sawhorse / seesaw  t-shape  linear | ||||
| 6 |  octahedral  square pyramid  square planar | ||||
| 7 |  pentagonal bipyramidal  pentagonal pyramidal |
3D
[edit]| Steric No. |
Basic Geometry 0 lone pair |
1 lone pair | 2 lone pairs | 3 lone pairs | 4 lone pairs |
|---|---|---|---|---|---|
| 1 |  linear | ||||
| 2 |  linear  linear | ||||
| 3 |  trigonal planar  bent / angular  linear | ||||
| 4 |  tetrahedral  trigonal pyramid  bent / angular  linear | ||||
| 5 |  trigonal bipyramid  sawhorse / seesaw  t-shape  linear | ||||
| 6 |  octahedral  square pyramid  square planar | ||||
| 7 |  pentagonal bipyramidal  pentagonal pyramidal |