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I. Lewis Diagrams

Molecular Structure. I. Lewis Diagrams. A. Octet Rule. Remember… Most atoms form bonds in order to have 8 valence electrons. F F F S F F F. F B F F. H O H. N O. Very unstable!!. A. Octet Rule. Exceptions :. Hydrogen  2 valence e -.

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I. Lewis Diagrams

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  1. Molecular Structure I. Lewis Diagrams

  2. A. Octet Rule • Remember… • Most atoms form bonds in order to have 8 valence electrons.

  3. F F F S F F F F B F F H O H N O Very unstable!! A. Octet Rule • Exceptions: • Hydrogen  2 valence e- • Groups 1,2,3 get 2,4,6 valence e- • Expanded octet  more than 8 valence e- (e.g. S, P, Xe) • Radicals  odd # of valence e-

  4. B. Drawing Lewis Diagrams • Find total # of valence e-. • Arrange atoms - singular atom is usually in the middle. • Form bonds between atoms (2 e-). • Distribute remaining e- to give each atom an octet (recall exceptions). • If there aren’t enough e- to go around, form double or triple bonds.

  5. B. Drawing Lewis Diagrams • CF4 1 C × 4e- = 4e- 4 F × 7e- = 28e- 32e- F F C F F - 8e- 24e-

  6. B. Drawing Lewis Diagrams • BeCl2 1 Be × 2e- = 2e- 2 Cl × 7e- = 14e- 16e- ClBeCl - 4e- 12e-

  7. B. Drawing Lewis Diagrams • CO2 1 C × 4e- = 4e- 2 O × 6e- = 12e- 16e- OCO - 4e- 12e-

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