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Unformatted text preview: angles of 90° • The observed H – P – H bond angle is 94° Valence Bond Theory  Promotion CH 4 would pose problems using the previous approach. Problem 1: C needs to make 4 bonds but has a 2s 2 2p 2 valence electron configuration Solution: excite the paired electrons to get 4 halffilled orbitals for bonding Can make 4 bonds but they will not all be the same (three 2p+1s overlaps and one 2s+1s overlap) ↑ ↓ ↑ ↑ 2s 2p ↑ ↑ ↑ ↑ 2s 2p Valence Bond Theory  Hybridization CH 4 is known to have four equivalent C – H bonds with tetrahedral bond angles. How can we explain this with valence bond theory? Algebraically combine 2 s and 2 p orbitals to give hybrid orbitals (sp 3 ) which have the correct geometry and are equivalent This is possible because we are treating the orbitals as waves. Combining the orbitals is equivalent to an interference pattern for waves sp 3 hybridization...
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 Spring '10
 YANG
 Electron, Chemical bond

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