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CHM 2095 Lecture Notes - Lecture 21: Electronegativity, Formal Charge, Fluorine

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viridiangoldfish502

24 Oct 2016

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Place the least electronegative atom in the center. This means that nf3 has a total of 26 valence electrons. :f: draw the lewis structure for of2. This means that of2 has a total of 20 valence electrons. :f o f: draw the lewis structure for co2. This means that co2 has a total of 16 valence electrons. :o=c=o: draw the lewis structure for o3. This means that o3 has a total of 18 valence electrons. Draw the lewis structure for no and all resonant structures. No has a total of 11 valence electrons. Resonance occurs when a molecule can be drawn with the same structure, but different appearance. For example, the structure in practice 3 can also be drawn as :o=o o: In the above example, formal charge must be evaluated to determine which structure is more stable and likely to exist in nature.

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