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

||   ||   ||