MO_and_VB_sum - VB theory , proceed as follows: I Start by...

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Chemistry 2000: MO and VB descriptions of bonding Marc R. Roussel
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MO descriptions of bonding To describe the bonding in a molecule using MO theory , proceed as follows: I Look at the valence AOs and, if available, at the AO energies. I Separate the AOs into sigma-type and pi-type. I Number of sigma MOs = number of sigma-type AOs I Number of pi MOs = number of pi-type AOs I Based on AO energies, say which AOs will combine with which to make MOs. I Identify any (exactly or approximately) nonbonding MOs obtained from the AOs. I Draw a reasonable MO diagram. I Populate it with the valence electrons. I Compute the bond order or answer any questions asked about the molecule.
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VB descriptions of bonding To describe the bonding in a molecule using
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Unformatted text preview: VB theory , proceed as follows: I Start by determining the electronic geometry at each non-terminal atom using VSEPR theory. I Use the following table: Electronic geometry Hybridization Left-over p orbitals Linear sp 2 Trigonal planar sp 2 1 Tetrahedral sp 3 I For the terminal atoms, you can also determine hybridization or (my preference) use an unhybridized unlled valence orbital. I Identify any orbitals which will contain lone pairs. I Start with the sigma bonds. Describe each of these as being made by combining the appropriate AOs (hybridized or not). I Describe any pi bonds as being made by combining left-over p orbitals....
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MO_and_VB_sum - VB theory , proceed as follows: I Start by...

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