Valence-Shell Electron-Pair Repulsion
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A is the central atom, B is a bonded atom, E is a nonbonding electron pair

2 Regions of Electron Density

AB2 Linear
CO2

3 Regions of Electron Density

AB3 Trigonal planar AB2E Bent (120 deg)
BF3 SO2

4 Regions of Electron Density

AB4 Tetrahedral AB3E Trigonal pyramidal AB2E2 Bent (109.5 deg)
CH4 NH3 H2O

5 Regions of Electron Density

AB5 Trigonal bipyramidal AB4E Seesaw AB3E2 T-shaped AB2E3 Linear
PCl5 SF4 ICl3 XeF2

6 Regions of Electron Density

AB6 Octahedral AB5E Square pyramidal AB4E2 Square planar
SF6 SbCl52- IF4-