vsepr theory

electron domains + molecular geometry

electron domains: 2

linear (180^.)

electron domains: 3

trigonal planar (120^.)

electron domains: 4

tetrahedral (109.5^.)

electron domains: 5 

trigonal bipyramidal (90^.+120^.)

electron domains: 6

octahedral (90^.)

linear (with no lone pair)

linear (will not have lone pairs at all)

trigonal planar (one lone pair)

bent 

tetrahedral (one lone pair)

trigonal pyramidal

tetrahedral (two lone pairs)

bent

trigonal bipyramidal (one lone pair)

see-saw

trigonal bipyramidal (two lone pairs)

t-shaped

trigonal bipyramidal (three lone pairs)

linear

octahedral (one lone pair)

square pyramidal

octahedral (two lone pairs)

square planar