CHEM 111 Lecture Notes - Formal Charge, Lone Pair, Lewis Structure
Document Summary
Till monday (10 / 18) at 6 pm. 2 hrs to complete (will not take that long) , how many lone pair electrons do you have: 8, 10, 16, 18, 20. These occur when you have more than one way to draw a lewis structure. Atom placement is the same, but electron placement is different. Resonance structures do not show what the molecule is in reality, it is only a means for us to understand electron placement. Resonance hybrid is what the molecule is in reality, combination of the resonance forms. Resonating electrons are delocalized, shown by dashed lines in the hybrid. Some contribute to the hybrid more than others. Formal charge = valence # - (# of lone pair electrons + # of bonded electrons) Sum of formal charges = charge on the molecule. Of formal charges of this whole resonance form is -1. The other form has the same formal charges.
