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oct 8 - Fri 8 Oct 10 Announcements Lecture 4 Exceptions to...

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1 Fri, 8 Oct 10 Announcements Lecture 4 Exceptions to the octet rule (13.12) Same Atoms, Different LDSs We have assumed up to this point that there is one correct Lewis structure for a given chemical formula. There are systems for which more than one Lewis structure is possible: Resonance Structures : Same atomic linkages, different bonding (single vs. double, etc). Real structure is an “average” of the available resonance structures. Structural Isomers : Different atomic linkages. “Formal Charge” is used to determine most likely structure.
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2 Structural Isomers Different sets of atomic linkages can be used to construct correct LDSs. Consider Cl 2 O: Both are correct, but is one of them “more” correct? Define “ Formal Charge ”…the apparent charge on the atoms in a LDS when atoms have not contributed equal numbers of electrons to the bonds joining them. Formal Charge is a shorthand way to describe how homogeneously electron density is distributed in a molecule.
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