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Formal Charge: How to tell if a Lewis Diagram is Correct

Formal Charge: How to tell if a Lewis Diagram is Correct. Calculating formal charge…. Formal charge is an accounting procedure applied to each atom. To calculate formal charge: # valence e - - (# non-bonding e - + ½ # bonding e - ). Consider H 2 CO 2.

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Formal Charge: How to tell if a Lewis Diagram is Correct

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  1. Formal Charge: How to tell if a Lewis Diagram is Correct Calculating formal charge…

  2. Formal charge is an accounting procedure applied to each atom. • To calculate formal charge: # valence e- - (# non-bonding e- + ½ # bonding e-)

  3. Consider H2CO2 # valence e- - (# non-bonding e- + ½ # bonding e-)

  4. Alternate dot diagram # valence e- - (# non-bonding e- + ½ # bonding e-)

  5. While both diagrams “work” , one is better…

  6. The best Lewis diagrams… • The sum of formal charges must equal 0 on all compounds; the best diagram has fewer formal charges. • For an ion, the sum of formal charges will equal the charge on the ion.

  7. Which diagram for carbon dioxide has fewer formal charges?

  8. For ‘carbonyl sulfide’, which structure is better?

  9. For ‘dinitrogen monoxide’, which structure is better?

  10. For NO2, which structure is better?

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