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. What is the hybridization on B? 1.sp 2.sp 2 3.sp 3 4.sp 3 d 5.sp 3 d 2

3. What is the hybridization on S? 1.sp 2.sp 2 3.sp 3 4.sp 3 d 5.sp 3 d 2

4. What is the hybridization on S? 1.sp 2.sp 2 3.sp 3 4.sp 3 d 5.sp 3 d 2

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

6. MO Diagram for H 2 H + H  H 2

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

8. H 2 /He 2 Examples

11. What is the bond order of He 2 + ? 1.0 2.0.5 3.1.0 4.1.5

12. H 2 /He 2 Examples

13. Homonuclear Diatomics