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 OO 2 between the two oxygen atoms unhybridized p orbitals of each oxygen atom, form the π bond ± result is a double bond (i.e. 2 bonding electron pairs) ± PROBLEM :theoxygenmo lecu leshowsphys
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2 2 ± paramagnetism is associated with unpaired electrons ± any substance that has unpaired electrons is attracted by an external magnetic field - the greater O 2 is a Paramagnetic Molecule th en umber of unpaired electrons th eg r e a t e rthe attraction to the external magnetic field 3 ± l i q u i do x y g e np o u r e di n t ot h es p a c eb e t w e e n the poles of a strong magnet ± a sample is weighed both in the presence of an external magnetic field and again when there is no Measuring Paramagnetism external magnetic field ± a paramagnetic sample is attracted to the external magnetic field and thus the measured weight of the sample appears to increase a diamagnetic sample is one is
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Lecture_25 - Todays Lecture Covalent Bonding: Orbitals 14.2...

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