12. Molecular Shapes & Valence Bond Theory

Apply Molecular Orbital Theory to determine the bond order of HHe⁺ ion.

Apply molecular orbital theory to predict which species has the strongest bond. 

a) O₂                             b) O₂^–                           c) O₂⁺                          d) All the bonds are equivalent 

Using Molecular Orbital Theory, answer the following questions dealing with carbon mononitride, CN. 

Determine the bond order in a molecule or ion with 12 valence electrons.

Complete the molecular orbital diagram for CN⁻. Note that the 1𝑠 orbitals are not shown.

Consider the valence molecular orbitals for the Na2 molecule that result from mixing the 3s valence atomic orbitals on each of the Na atoms.

a. How many molecular orbitals will be formed?

b. What is the bond order of the Na2 molecule?

c. What is the bond order of the Na2+ molecular ion?

d. Which is expected to have the longer Na—Na bond, Na2 or Na2+?

e. Which is expected to have the stronger Na—Na bond, Na2 or Na2+?