These are the structures of molecules which do NOT have a central atom of C, N, O, or F. Link to the original document Atomic Structure Exceptions 6 Effective Pairs 6 Bonds 5 Bonds, 1 Lone Pair 4 Bonds, 2 Lone Pairs Octahedral Square Pyramidal Square Planar 5 Effective Pairs 5 Bonds 4 Bonds, 1 Lone Pair 3 Bonds, 2 Lone Pairs 2 Bonds, 3 Lone Pairs Trigonal Bipyramid Distorted Tetrahedral T-Shaped Linear 4 Effective Pairs 4 Bonds 3 Bonds, 1 Lone Pair 2 Bonds, 2 Lone Pairs Tetrahedral Trigonal Pyramid V-Shaped/Bent 3 Effective Pairs 3 Bonds 2 Bonds, 1 Lone Pair Trigonal Planar V-Shaped/Bent