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ABxEy Notation

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

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ABxEy Notation

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  1. ABxEy Notation

  2. How can geometric structure in 3d be predicted given the numbers of valence electrons?

  3. 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

  4. Example: Water H2O Oxygen CA Hydrogen surrounding atoms 2 surrounding atoms 2 pairs of unshared valence electrons Notation for ABxEy would be:

  5. Answer: AB2E2 YOUR TURN… CO2 CH4 NH3 PCl5 SF6 BF3 BrF5 IF4

  6. C N O P S may have multiple bonds… double or triple Rare for Cl

  7. Get VSEPR from ABxEy notation How many groups of e-? X + Y= total groups of v e- THIS determines shape of molecule

  8. What are the shapes of molecules ? How is geometry predicted?

  9. RESONANCE Multiple bonds Deficient Extended Odd number of v e-

  10. 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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