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What is Valence Bond (VB) Theory say?
Orbitals of two atoms overlap, and the electrons occupy the overlapping region.
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Linear Electron configuration:
Which orbitals are hybridized?
How many hybrid orbitals of what type are formed?
How many unhybridized orbitals of what type remain?
- Hybridized: one s, one p
- Hybrids formed: two sp
- Unhybridized: two p
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Trigonal planar configuration:
Which orbitals are hybridized?
How many hybrid orbitals of what type are formed?
How many unhybridized orbitals of what type remain?
- Hybridized: one s, two p
- Hybrids formed: three sp2
- Unhybridized: one p
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Tetrahedral configureation:
Which orbitals are hybridized?
How many hybrid orbitals of what type are formed?
How many unhybridized orbitals of what type remain?
- Hybridized: one s, three p
- Hybrids formed: four sp3
- Unhybridized: none
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Trigonal Bipyramidal:
Which orbitals are hybridized?
How many hybrid orbitals of what type are formed?
How many unhybridized orbitals of what type remain?
- Hybridized: one s, three p, one d
- Hybrids formed: five sp3d
- Unhybridized: four d
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Octahedral configuration:
Which orbitals are hybridized?
How many hybrid orbitals of what type are formed?
How many unhybridized orbitals of what type remain?
- Hybridized: one s, three p, two d
- Hybrids formed: six sp3d2
- Unhybridized: three d
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Which is stronger? A pi bond, or a sigma bond?
A sigma bond is stronger because orbitals overlap more end-to-end than side-to-side
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Which bond restricts rotation?
Pi Bonds because the interacting orbitals need to be parallel to each other.
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What is the difference between VB and MO theories?
- VB says the orbitals are localized
- MO says they are delocalized.
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What is the electron configuration of H2?
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How do you compute the MO bond order?
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Three points about MO bond order:
- A bond order > 0: the bond is more stable than separate atoms
- Bond order = 0: The bond is as stable as separate atoms, so it will not form.
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What is the typical energy order for MOs derived from 2p orbitals?
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