CH9 notes - Chapter 9 Molecular Geometry A. B. C. D. E. F....

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Chapter 9 Molecular Geometry A. Valence Shell Electron Pair Repulsion B. Molecular Polarity C. Hybridization D. Multiple Bonds E. Summary F. Diatomic Molecular Orbitals HW #P9 Covered On Final Exam
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NH 3 H N H H Chapter 9 Molecular Geometry What Shape Do Molecules Have? Lewis structures give electron arrangements which we will use to derive shapes. Bonding occurs through valence electrons that are attracted to nuclei, but repel each other. How can electrons arrange to minimize repulsion? A. Valence Shell Electron Pair Repulsion Table 9.1 Examples: What is the geometry of PCl 5 and NH 4 + ? Electron pairs don = t have to be shared. four pairs are tetrahedral; therefore, the atoms are trigonal pyramidal
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Example: What is geometry of atoms in H 2 O? Compare CH 4 , NH 3 , H 2 O molecule H B A B H angle CH 4 109.5 E NH 3 107 E H 2 O 104.5 E Unshared pairs require a larger space than do shared pairs!
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Consider SF 4 Table 9.2 VSEPR Procedure (1) Count the valence electrons and construct the Lewis dot structure. (2)
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CH9 notes - Chapter 9 Molecular Geometry A. B. C. D. E. F....

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