Zumdahl+Chap+14+Lecture+Notes+2

Zumdahl+Chap+14+Lecture+Notes+2 - For O F and N e e ffe c...

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10/23/07 Zumdahl Chapter 14 1 B 2 and O 2 are paramagnetic ! For O, F and Ne, effective nuclear charge is larger so ! 2s electrons are held closer to nuclei and don’t repel ! 2p electrons as much as for B, C and N ! So, for O and F ! 2p is filled before " 2p
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10/23/07 Zumdahl Chapter 14 2 O 2 ! Electron configuration: ! 2s 2 ! 2s * 2 ! 2p 2 " 2p 4 " 2p * 2 ! Bond order: (1/2)(6 - 2) = 2 --> Double bond, consistent with Lewis structure. But… ! Lewis structure predicts all e - are paired, so O 2 would be diamagnetic ! MO theory correctly predicts that 2 e - go into two " 2p * with parallel spins, and O 2 would be paramagnetic This agrees with experiment! O O
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10/23/07 Zumdahl Chapter 14 3 Heteronuclear Diatomics ! Energy levels of more electronegative atom are lower ! Larger contribution of more electronegative atom to bonding MOs, Less electronegative atom contributes more to antibonding MOs 2s 2s 2p 2p ! 2s ! 2s * ! 2p ! 2s * " 2p " 2p * N N N 2 2s 2s 2p 2p N O ! 2s ! 2s * ! 2p ! 2s * " 2p " 2p * NO
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10/23/07 Zumdahl Chapter 14 4 Heteronuclear Diatomics ! NO molecule NO+ and CN- ions
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10/23/07 Zumdahl Chapter 14 5 Heteronuclear Diatomics ! HF molecule
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