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Lecture_25 - Todays Lecture Covalent Bonding Orbitals 14.2...

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1 1 Covalent Bonding: Orbitals Today’s Lecture 14.2 The Molecular Orbital Model 1 assumes that electron pairs are localized thus the concept of resonance must be added only deals with even electron molecules - does not readily Problems with the LE Model only deals with even electron molecules does not readily deal with unpaired electrons oversimplified model e.g. O 2 sp 2 hybrid orbitals overlap to form the σ bond between the two oxygen atoms O O 2 unhybridized p orbitals of each oxygen atom, form the π bond result is a double bond (i.e. 2 bonding electron pairs) PROBLEM: the oxygen molecule shows physical properties characteristic of a molecule with unpaired electrons
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