Chapter 9.8-9.9 as handout

Chapter 9.8-9.9 as handout - 9.8 Example : What are the...

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1 O O O O O O O O O Formal Charge and Lewis Structures 9.7 O O O A. B. C. D. We have 3 × 6 = 18 valence electrons to work with. A resonance structure is one of two or more Lewis structures for a single molecule that cannot be represented accurately by only one Lewis structure. 9.8 Despite the Lewis dot structure prediction that ozone is a triangular molecule, it is actually bent: NOTE : Lewis dot structures do not predict molecular shapes . They keep track of electrons (e.g. lone pairs, bonds, charges). O O + - O O O O + - There are 2 ways to write the Lewis structure. Which is correct? O O O + - A resonance structure is one of two or more Lewis structures for a single molecule that cannot be represented accurately by only one Lewis structure.
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Unformatted text preview: 9.8 Example : What are the resonance structures of the carbonate (CO 3 2– ) ion? C O--O O O C O O--O C O O--2 Exceptions to the Octet Rule: Incomplete Octet H H Be Be – 2e-2H – 2x1e-4e-Example : BeH 2 Example : BF 3 B – 3e-3F – 3x7e-24e- 3 single bonds (3x2) = 6 9 lone pairs (9x2) = 18 Total = 24 9.9 F B F F S F F F F F F Exceptions to the Octet Rule Odd-Electron Molecules N – 5e-O – 6e-11e-Example : NO The Expanded Octet (central atom with principal quantum number n > 2) Example : SF 6 S – 6e-6F – 42e-48e-6 single bonds (6x2) = 12 18 lone pairs (18x2) = 36 Total = 48 9.9 N O...
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This note was uploaded on 02/20/2012 for the course CHEM 1230 taught by Professor Anderson during the Spring '08 term at Toledo.

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Chapter 9.8-9.9 as handout - 9.8 Example : What are the...

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