Electron geometry and bond angle are related as:

**Electron Regions Electronic Geometry Bond Angles**

2 linear 180˚

3 trigonal planar 120˚

4 tetrahedral 109.5˚

5 trigonal bipyramidal 90˚, 120˚, and 180˚

6 octahedral 90˚ and 180˚

For O_{3}:

- O in the middle follows trigonal planar geometry
- However, 1 lone pair on the top will lessen the O-O-O bond angle

Therefore, the answer is <120°

For SO_{3}:

- O in the middle follows trigonal planar geometry
- No lone pairs are present in S so this will follow 120°

Therefore, the answer is 120°

For SCl_{2}

- This follows AX
_{2}E_{2 }which is tetrahedral electron geometry - However, 2 lone pairs are present in S

Therefore, the answer is <109.5°

Select the correct value for the indicated bond angle in each of the following compounds:

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