# of bonding groups/domains on 'central' atom

# of lone pair electrons on 'central' atom

Electron-pair Geometry

Molecular Geometry

Bond
Angle

2

0

linear

linear

180

3

0

trigonal planar

trigonal planar

120

2

1

trigonal planar

bent

less than 120

4

0

tetrahedral

tetrahedral

109.5

3

1

tetrahedral

trigonal pyramidal

less than 109.5

2

2

tetrahedral

bent

less than 109.5

5

0

trigonal bipyramidal

trigonal bipyramidal

90, 120 and 180

4

1

trigonal bipyramidal

seesaw

90, 120 and 180

3

2

trigonal bipyramidal

T-shaped

90 and 180

2

3

trigonal bipyramidal

linear

180

6

0

octahedral

octrahedral

90 and 180

5

1

octahedral

square pyramidal

90 and 180

4

2

octahedral

square planar

90 and 180