Molecular Orbital Theory

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Molecular Orbital Theory

• Atomic orbitals mix together and make
• Bonding Orbitals
• Electrons in these orbitals help hold atoms near
  each other
• Antibonding Orbitals
• Electrons in these orbitals push atoms apart from
  each other
• Nonbonding Orbitals
• Electrons in these orbitals have no effect on
  bonding

• Molecular Orbitals can
• be Sigma or Pi
• be spread over multiple atoms

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Molecular Orbital Theory

• Molecular Orbitals can
• be Sigma or Pi
• be spread over multiple atoms

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MO Diagram for H2H H ? H2
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Li2
Bond Order 2 electrons in a bonding orbital 1
bond 2 electrons in an antibonding orbital -1
bond
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H2/He2 Examples
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MOs from p-Orbitals
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General MO Diagram for p-block elements
Use handout to fill in and determine bond orders
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Paramagnetic a compound with any unpaired
electrons Diamagnetic no unpaired electrons.
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Who Cares?Top 5 reasons.

• Paramagnetism.
• Excited states, colors, glowing things.
• Eyesight.
• Structures of all the molecules.
• Its actually right.

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