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Unformatted text preview: Chem111 Fall, 2005 51 VSEPR is an approximation! We want more consider a typical homonuclear diatomic H 2 H : H covalent bond simple picture = 2 e- "shared" between nuclei bond we know more! molecule arises through interplay of several forces i. electron-electron repulsion ii. nucleus-nucleus repulsion iii. electron-nucleus attraction locations of the electrons lead us again to probability Lecture 15: Bonding and Molecules Molecular Orbitals (I) Potential Energy (kJ/mol) 0 -432- r H-H () 0.74 Chem111 Fall, 2005 52 we will deal with this using a simple approach and the solutions we already found with the hydrogen atom (see? these are useful!) L inear C ombination of A tomic O rbitals = M olecular O rbitals LCAO-MO Homonuclear Diatomics (X 2 ) 1. Take the valence atomic orbitals of the atoms in the bond, and make linear combinations (e.g. add and subtract them in various combinations) to form molecular orbitals 2. Occupy the molecular orbitals using the standard...
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