need answer to this one Which of the following is TRUE?Select one:O a. Only Hund's Rule and Pauli's Exclusion Principle applies in determining the ground state MO configuration of a compound.O b. A bonding ozyorbital is lower in energy than an antibonding o," orbital.Oc. It is possible that the number of bonding orbitals exceed the number of antibonding orbitals.Od. Two electrons of opposing spin can occupy a molecular orbital.

No two electrons have same set of quantum numbers.

hich of the following is TRUE? lect one: O a. Only Hund's Rule and Pauli's Exclusion Principle applies in determining the ground state MO configuration of a compound. Ob. A bonding zorbital is lower in energy than an antibonding o;," orbital. Oc. It is possible that the number of bonding orbitals exceed the number of antibonding orbitals. O d. Two electrons of opposing spin can occupy a molecular orbital.

hich of the following is TRUE? lect one: O a. Only Hund's Rule and Pauli's Exclusion Principle applies in determining the ground state MO configuration of a compound. Ob. A bonding zorbital is lower in energy than an antibonding o;," orbital. Oc. It is possible that the number of bonding orbitals exceed the number of antibonding orbitals. O d. Two electrons of opposing spin can occupy a molecular orbital.

Chemistry

9th Edition

ISBN:9781133611097

Author:Steven S. Zumdahl

Publisher:Steven S. Zumdahl

Chapter9: Covalent Bonding: Orbitals

Section: Chapter Questions

Problem 41E: Consider the following molecular orbitals formed from the combination of two hydrogen 1s orbitals:...

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The molecular ion HeH+ has an equilibrium bond length of 0.774 Å. Draw an electron correlation diagram for this ion, indicating the occupied MOs. Is HeH+ paramagnetic? When HeH+ dissociates, is a lower energy state reached by forming He+H+ or He++H ?
Consider the following molecular orbitals formed from the combination of two hydrogen 1s orbitals: a. Which is the bonding molecular orbital and which is the antibonding molecular orbital? Explain how you can tell by looking at their shapes. b. Which of the two molecular orbitals is lower in energy? Why is this true?
Consider the incomplete orbital representation of O2 , below right. a. Identify which lobes are hybrid orbitals (identify the type) and which lobes arep orbitals. b. Use dotted lines to show any bonds. c. Use up or down arrows to show electron occupation of each hybrid orbital or bond.
Discuss the nature of the bonding in the nitrite ion (NO2) . Draw the possible Lewis resonance diagrams for this ion. Use the VSEPR theory to determine the steric number, the hybridization of the central nitrogen atom, and the geometry of the ion. Show how the use of resonance structures can be avoided by introducing a de-localized MO. What bond order does the MO model predict for the NO bonds in the nitrite ion?
The orbital potential energies for the 4s and 4p of Br are -18.65 ev and -12.49 ev, respectively. Recall that the H 1s is -13.61 ev. The MO diagrams for HBr is not exactly the same as HF. Draw the MO diagram for HBr, including energy levels, each orbitals shape, each orbitals character (meaning what atomic orbitals contribute to each M.O. and how much), symmetry labels indicate the HOMO and LUMO, the bond order (show your work), whether the molecule is paramagnetic or diamagnetic. Compare and contrast the MO diagrams of HF and HBr.
Represent the bonding in each molecule or ion by drawing the orbitals (hybridized and unhybridized) of each atom in the bond. Label the σ and π bonds and label each bond by the orbitals that it is made from. For instance, the C–H bond in CH4 would be made from the overlap of: C (sp3) – H (1 s). You may draw the hybridized sigma orbitals as sticks and the unhybridized p-orbitals as lobes for clairity and ease. a. HONO b. CH3 CCH c. C3 H4 d. C2 O4 2-
Draw an mo diagram for the valence electrons in F2. What is the bond order many sigma and pi bonds are there? What is the HOMO(Highest Occupied Molecular Orbital) and LUMO(Lowest Unoccupied Molecular Orbital)? What is the magnetism of the species?
a) What is the difference between a localized π bond and adelocalized one? (b) How can you determine whether a moleculeor ion will exhibit delocalized π bonding? (c) Is the πbond in NO2- localized or delocalized?
Use MO diagrams and the bond orders you obtain fromthem to answer: (a) Is Be₂⁺ stable? (b) Is Be₂⁺ diamagnetic? (c) What is the outer (valence) electron configuration of Be₂⁺?
Calcium carbide, CaC2,contains the acetylide ion, C22-.Sketch the molecular orbital energy'level diagram for the ion and the electron dot strucure. (a) How many net σ and π bonds does the ion have? (b) What is the carbon-carbon bond order? (c) Compare the valence bond and MO pictures with regard to the number of σ and π bonds and the bond order. (d) How has the bond order changed on adding electrons to C2 to obtain C22-? (e) Is the C22- ion paramagnetic?
(a) Using only the valence atomic orbitals of a hydrogenatom and a fluorine atom, and following the model ofFigure 9.46, how many MOs would you expect for the HFmolecule? (b) How many of the MOs from part (a) would beoccupied by electrons? (c) It turns out that the difference inenergies between the valence atomic orbitals of H and F aresufficiently different that we can neglect the interaction ofthe 1s orbital of hydrogen with the 2s orbital of fluorine.The 1s orbital of hydrogen will mix only with one 2p orbitalof fluorine. Draw pictures showing the proper orientationof all three 2p orbitals on F interacting with a 1s orbitalon H. Which of the 2p orbitals can actually make a bondwith a 1s orbital, assuming that the atoms lie on the z-axis?(d) In the most accepted picture of HF, all the other atomicorbitals on fluorine move over at the same energy into themolecular orbital energy-level diagram for HF. These arecalled “nonbonding orbitals.” Sketch the energy-level diagramfor HF using…
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