ch10 2_Part1 - GENERAL CHEMISTRY CHAPTER 10 PART II...

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GENERAL CHEMISTRY CHAPTER 10: PART II – CHEMICAL BONDING PAGE 1 OF 15 The now-paired electrons in the overlapping orbitals are attracted to the nuclei of both atoms Two atoms bond together H-H bond results from the overlap of two singly occupied 1s orbitals Overlap occurs with electrons of opposite spin F-F bond results from overlap of two singly occupied 2p orbitals Two p orbitals must point directly at each other for optimum overlap to occur Overlap occurs with electrons of opposite spin The F-F bond forms along the p orbital axis Limitations of the Lewis Model and VSEPR Model The electron-dot structures of the Lewis Model is a simple way to predict the distribution of valence electrons in a molecule oversimplified approach Lewis Model cannot write one correct structure for molecules where resonance is important Lewis Model cannot accurately predict if a molecule is paramagnetic or diamagnetic VSEPR provides a simple way to predict molecular shapes Neither model describes the detailed electronic nature of covalent bonds More advanced theories treat electrons in a quantum mechanical manner Can accurately predict bond lengths, bond strengths, molecular geometries, and dipole moments Valence Bond Theory = quantum mechanical model which shows how electron pairs are shared in a covalent bond Valence Bond Theory Provides an orbital picture of how electron pairs are shared in a covalent bond A covalent bond results when two atoms approach each other closely enough so that a singly occupied valence orbital on one atom spatially overlaps a singly occupied valence orbital on the other atom The strength of a covalent bond depends on the amount of orbital overlap The greater the overlap stronger the bond Since s orbitals are spherical, overlap with another orbital does not depend on direction For p, d, f orbitals, direction is important
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This note was uploaded on 01/21/2011 for the course PHYS 4A 60865 taught by Professor L. oldewurtel during the Fall '09 term at Irvine Valley College.

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ch10 2_Part1 - GENERAL CHEMISTRY CHAPTER 10 PART II...

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