VSPER Theory

EGG of atom with 2 electron groups

linear

EGG of atom with 3 electron groups

trigonal planar

EGG of atom with 4 electron groups

tetrahedral

EGG of atom with 5 electron groups 

trigonal bipyramidal

EGG of atom with 6 electron groups

octahedral

molecular geometry of atom with 2 electron groups (0 lone pairs)

linear

molecular geometry of atom with 3 electron groups (1 lone pair)

bent

molecular geometry of atom with 4 electron groups (1 lone pair)

trigonal pyramid

molecular geometry of atom with 4 electron groups (2 long pairs)

bent

molecular geometry of atom with 5 electron groups (1 lone pair)

see-saw

molecular geometry of atom with 5 electron groups (2 lone pairs)

T-shaped

molecular geometry of atom with 5 electron groups (3 lone pairs)

linear

molecular geometry of atom with 6 electron groups (1 lone pair)

square pyramidal

molecular geometry of atom with 6 electron groups (2 lone pairs)

square planar

molecular geometry of atom with 6 electron groups (3 lone pairs)

T-shaped

molecular geometry of atom with 6 electron groups (4 lone pairs) 

linear