chem104alecture17 - Chem 104A, UC, Berkeley Chem 104A, UC,...

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1 Chem 104A, UC, Berkeley VSEPR Valence Shell Electron Pair Repulsion DG Chapt 2 z Allows the prediction of molecular geometry z Sidgwick + Powell 1940 z Gillespie + Nyholm 1957 z Count up the number of steric contribution around the central atom. Steric number (SN) =# of attached atom + # of lone pairs z Assume that electron pairs around central atom repel each other, the most stable geometry corresponds to that obtained by maximizing the distance between SN points on the surface of a sphere, minimizing electron pair repulsion. Chem 104A, UC, Berkeley Chem 104A, UC, Berkeley VSEPR Valence Shell Electron Pair Repulsion z Lone pair electrons are held in closer to the nucleus. Most prohibitive repulsion is lp-lp, followed by lp-bp, then bp-bp…lps will spread out as much as possible. z Lps occupy more space than bond pairs, ….large angle between lps than nps. Chem 104A, UC, Berkeley
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2 Chem 104A, UC, Berkeley Chem 104A, UC, Berkeley LGO1 LGO2 LGO3 2s 2p x 2p y 2p z B3 H b s σ b x b y nb z π * s * x * y ' 1 1 a ' 1 1 e ' ' 2 1 a ' 1 ' 1 2 2 a e
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chem104alecture17 - Chem 104A, UC, Berkeley Chem 104A, UC,...

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