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 H2 H + 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.