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greyalpaca833Lv1

28 Nov 2020

The molecular orbital diagram of HF looks different than most other diatomic species because the electronegativity difference between H and F is so large. The 1s atomic orbital of H interacts with just one of the 2p atomic orbitals of F to form a bonding σ molecular orbital and an antibonding σ* molecular orbital. This leaves the 2s orbital and two of the 2p orbitals of F as nonbonding orbitals.

Construct the molecular orbital diagram for HF.

Identify the bond order.

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Patrick SuarezLv10

14 Jan 2021

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(a) Using only the valence atomic orbitals of a hydrogen atom and a fluorine atom, and following the model of Figure 9.46, how many MOs would you expect for the HF molecule? (b) How many of the MOs from part (a) would be occupied by electrons? (c) It turns out that the difference in energies between the valence atomic orbitals of H and F are sufficiently different that we can neglect the interaction of the 1s orbital of hydrogen with the 2s orbital of fluorine. The 1s orbital of hydrogen will mix only with one 2p orbital of fluorine. Draw pictures showing the proper orientation of all three 2p orbitals on F interacting with a 1s orbital on H. Which of the 2p orbitals can actually make a bond with a 1s orbital, assuming that the atoms lie on the z-axis? (d) In the most accepted picture of HF, all the other atomic orbitals on fluorine move over at the same energy into the molecular orbital energy-level diagram for HF. These are called “nonbonding orbitals.” Sketch the energy-level diagram for HF using this information and calculate the bond order. (Nonbonding electrons do not contribute to bond order.) (e) Look at the Lewis structure for HF. Where are the nonbonding electrons?

chocolatehedgehog590

1. Use the Molecular Orbital Diagram to calculate the Bond order for the following Chemical Species?

A. He He

B. He He+

C. N N

D. B B

E. O O

F. F₂

_{G. F- F-}

_{H. F+ F-}

_{2. Which of these chemical species is stable, according to (or as predicted by) molecular orbital theory?}

How did you know this or how were you able to determine this?

3. Which is the most stable(as predicted by MO theory)

4. Are there any chemical species that would be attracted to a magnetic field? How were you able to determine this?

5. Use Valence bond theory to describe which atomic orbitals overlap in N2. Draw a bonding scheme that shows the atomic orbitals overlapping.

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