Shapes of molecules

• electron repulsion (greatest to least) - two lone pairs - lone pair and bonded pair - two bonded pairs
• electron pair repulsion theory states that electron pairs repel each other to be as far apart as possible
• linear - 2 bonded pairs - 0 lone pairs - 180 degrees
• trigonal planar - 3 bonded pairs - 0 lone pairs - 120 degrees
• tetrahedral - 4 bonded pairs - 0 lone pairs - 109.5 degrees
• trigonal bipyramidal - 5 bonded pairs - 0 lone pairs - 90 degrees - 120 degrees
• hexagonal - 6 bonded pairs - 0 lone pairs - 90 degrees - 180 degrees
• trigonal pyramidal - 3 bonded pairs - 1 lone pair - 107 degrees
• angular (non-linear) - 2 bonded pairs - 2 lone pairs - 104.5 degrees