AP Chemistry--Molecular Geometry

Linear

2 electron groups, 0 lone pairs, bond angle 180 degrees

Trigonal planar

3 electron groups, 0 lone pairs, bond angle 120 degrees

Bent

3 electron groups, 1 lone pair, bond angle <120 degrees

Tetrahedral

4 electron groups, 0 lone pairs, bond angle 109.5 degrees

Trigonal pyramid

4 electron groups, 1 lone pair, bond angle <109.5 degrees (about 107 degrees)

Bent

4 electron groups, 2 lone pairs, bond angle <109.5 degrees (about 105 degrees)

Trigonal bipyramidal

5 electron groups, 0 lone pairs, bond angles 90 and 120 degrees

Seesaw

5 electron groups, 1 lone pair, bond angles <90 and <120 degrees

T-structure

5 electron groups, 2 lone pairs, bond angles <90 degrees

Linear

5 electron groups, 3 lone pairs, bond angle 180 degrees

Octahedral

6 electron groups, 0 lone pairs, bond angles 90 degrees

Square pyramidal

6 electron groups, 1 lone pair, bond angles 90 and <90 degrees

Square planar

6 electron groups, 2 lone pairs, bond angle 90 degrees