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ABxEy Notation How can geometric structure in 3d be predicted given the numbers of valence electrons? A represents central atom B represents surrounding atoms E represents unshared pairs of valence electrons on CA x and y - subscripts that represent number of surrounding atoms (B) and number of unshared pairs of valence electrons (E)on CA Example: Water H2O Oxygen CA Hydrogen surrounding atoms 2 surrounding atoms 2 pairs of unshared valence electrons Notation for ABxEy would be: CO2 CH4 NH3 PCl5 SF6 BF3 BrF5 IF4 Answer: AB2 E2 YOUR TURN… C N O P S may have multiple bonds… double or triple Rare for Cl Get VSEPR from ABxEy notation How many groups of e-? X + Y= total groups of v eTHIS determines shape of molecule What are the shapes of molecules ? How is geometry predicted? RESONANCE Multiple bonds Deficient Extended Odd number of v e- Resonance Double bond or other may occur Anywhere on diagram Can flip in nature May move valence e- and flip bond ! Where it is, averages out
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