1. Molecular Orbitals
Two interacting orbitals make two new orbitals. Using a 1s orbital on two H atoms:
anitbonding orbital =
higher energy
bonding orbital =
lower energy

2. MO Diagrams: H and He molecules
Atomic orbitals on the sides; molecular orbitals inside.

3. MO Diagrams
Atomic orbitals on the sides; molecular orbitals inside.

4. MOs involving p orbitals
Two interacting orbitals make two new orbitals. Using a 1s orbital on two H atoms:
sigma orientation =
pointing at each other
pi orientation =
pointing side-by-side

5. p-Orbital MO Diagrams Li2 – N2

6. p-Orbital MO Diagrams Li2 – N2
What about the 1s
and 2s orbitals?

7. p-Orbital MO Diagrams Li2 – N2

8. p-Orbital MO Diagrams O2 – Ne2

9. p-Orbital MO Diagrams O2 – Ne2

10. Heteronuclear Diatomics: CO