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Molecular Orbital Theory

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

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Molecular Orbital Theory

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  1. 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

  2. Molecular Orbital Theory Molecular Orbitals can: be Sigma or Pi be spread over multiple atoms

  3. MO Diagram for H2H + H  H2

  4. Li2 Bond Order: 2 electrons in a bonding orbital = 1 bond 2 electrons in an antibonding orbital = -1 bond

  5. H2/He2 Examples

  6. MOs from p-Orbitals

  7. General MO Diagram for p-block elements Use handout to fill in and determine bond orders

  8. Paramagnetic: a compound with any unpaired electrons Diamagnetic: no unpaired electrons.

  9. Who Cares?Top 5 reasons. • Paramagnetism. • Excited states, colors, glowing things. • Eyesight. • Structures of all the molecules. • It’s actually right.

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