Part C: Sometimes formal charges can be a useful method of deciding between more than one valid Lewis structure, especially if experimental data is not yet available. 1. There are two valid Lewis structures for . Draw them both, and determine which one is more favored, according to formal charges. Part D: Because of non-bonding pairs on the central atoms, some molecules have geometries that are somewhat distorted from regular geometries. 1. Draw Lewis structures for OF2 and PF3, and describe how the bond angles are distorted from normal.

Part C: Circle the favored structure. N Show calculations for formal charges. Part D: Describe how the bond angles are distorted from normal