Chapter 10.6-10.8 as handout

Chapter 10.6-10.8 as handout - 2. The more stable the...

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1 Molecular orbital theory – bonds are formed from interaction of atomic orbitals to form molecular orbitals. O O No unpaired e - Should be diamagnetic Experiments show O 2 is paramagnetic 10.6 Energy levels of bonding and antibonding molecular orbitals in hydrogen (H 2 ). A bonding molecular orbital has lower energy and greater stability than the atomic orbitals from which it was formed. An antibonding molecular orbital has higher energy and lower stability than the atomic orbitals from which it was formed. 10.6 10.6 Also see: http://en.wikipedia.org/wiki/Atomic_orbital The section called “ Understanding why atomic orbitals take these shapes ” has an excellent animation of the orbitals as standing waves. This helps visualize how the orbitals can combine constructively and destructively.
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2 Li 2 Molecule σ 1s σ 1s * MO Theory for Homonuclear Diatomics Two Possible Interactions Between Two Equivalent p Orbitals 10.6
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3 1. The number of molecular orbitals (MOs) formed is always equal to the number of atomic orbitals combined.
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Unformatted text preview: 2. The more stable the bonding MO, the less stable the corresponding antibonding MO. 3. The filling of MOs proceeds from low to high energies. 4. Each MO can accommodate up to two electrons. 5. Use Hunds rule when adding electrons to MOs of the same energy. 6. The number of electrons in the MOs is equal to the sum of all the electrons on the bonding atoms. 10.7 Molecular Orbital (MO) Configurations bond order = 1 2 Number of electrons in bonding MOs Number of electrons in antibonding MOs (-) 10.7 bond order 1 Bond order give a qualitative measure of the strength of a bond 10.7 4 Delocalized molecular orbitals are not confined between two adjacent bonding atoms, but actually extend over three or more atoms. 10.8 Electron density above and below the plane of the benzene molecule. 10.8 Some carbon materials have extended MOs C 60- Buckminsterfullerene graphite carbon nanotube benzene...
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Chapter 10.6-10.8 as handout - 2. The more stable the...

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