(6 pts.) 1. How many atomic orbitalsmake up the set with n = 3 and l = 2? What label is given to this set of orbitals?

(4 pts.) 2. Give the ground state electronic configuration of As.

(12 pts.) 3. Use the VSEPR Theory to predic the shape of (must show Lewis Electron Dot Struture, number of bond pairs and number of lone pairs for full credit):

(4 pts.) 4. Draw the bonding and antibonding molecular orbitals that would be formed from two p_z atomic orbitals.

(6 pts.) 5. Give the molecular orbital energy level diagram for O₂ that shows its paramagnetic behavior.

6. For the methane molecule,

(3 pts.) (a.) what order is the principle axis of rotation?

(3 pts.) (b.) what type of mirror plane is present?

(5 pts.) 7. The half-life of strontium–90 is 29.1 years. Determine the rate constant for the decay of strontium-90?

8. For PF₂I₃, show the two geometric isomers (cis and trans):

(3 pts.) (a.) shape of cis isomer.

(3 pts.) (b.) shape of trans isomer.

(3 pts.) (c.) pick the principle axis of rotation for the cis structure.

(3 pts.) (d.) pick the principle axis of rotation for the trans structure.

(3 pts.) (e.) select the point group for the cis structure.

(3 pts.) (e.) select the point group for the trans structure.

(8 pts.) 9. Account for why the "see-saw" shaped SF₄ in solution at 298 K gives a singlet in the ¹⁹F NMR spectrum whereas the spectrum at 175 K shows two equal intensity triplets.

(6 pts.) 10. How might you use ³¹P NMR spectroscopy to distinguish between Ph₂PH and Ph₃P? (HINT: ³¹P and ¹H can couple when bonded to each other in these ammonia like structrues).

(5 pts.) 11. What is meant by a three centered bond? Give an example.

12. All of the atoms in the carbonate ion, [CO₃]^-2, use sp² hybridization in bonding.

(4 pts.) (a.) Show the orbitals combined to form the sigma bonds.

(4 pts.) (b.) Show the orbitals combined to form the delocalized pi bonds.

(6 pts.) 13. Draw the structures of the two (mer and fac) octahedral isomers of MA₃B₃.

(8 pts.) 14. Complete the nuclear reaction by supplying the missing information:

(a.) ₉₂U²³⁸ + ₀n¹ à + ₀g⁰

(b.) ₉₂U²³⁵ + ₀n¹ à ₃₄Se⁸⁵ + + 3 ₀n¹