Lecture 4 - Chem 172 Advanced Inorganic Chemistry Lecture 4...

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1 Chem 172 Advanced Inorganic Chemistry Lecture 4 Valence Bond Theory Molecular Orbital Theory • Allows the prediction of molecular geometry (1) Count up the number of steric contribution around the central atom. Steric number (SN) = # of attached atom + # of lone pairs (2) Assume that electron pairs around central atom repel each other, the most stable geometry requires to position the valence electrons pairs as far as possible to minimize electron-electron repulsion. (3) In general, for any steric point that may cause larger electron density near the central atom ( lone pairs, multiple bonds, electron given outer atoms (less electronegativity ), will require more space to minimize electron-electron repulsion. Valence Shell Electron-Pair Repulsion Theory (VSEPR)
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2 Valence Bond Theory The valence-bond theory is built upon the Lewis concept (quantum mechanical treatment of Lewis concept). (1) A covalent bond formed by paring of unpaired electrons
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Lecture 4 - Chem 172 Advanced Inorganic Chemistry Lecture 4...

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