(a) Sketch the molecular orbitals of the H2– ion and draw its energy-level diagram. (b) Write the electron configuration of the ion in terms of its MOs. (c) Calculate the bond order in H2-. (d) Suppose that the ion is excited by light, so that an electron moves from a lower-energy to a higher-energy molecular orbital. Would you expect the excited-state H2- ion to be stable? (e) Which of the following statements about part (d) is correct: (i) The light excites an electron from a bonding orbital to an antibonding orbital, (ii) The light excites an electron from an antibonding orbital to a bonding orbital, or (iii) In the excited state there are more bonding electrons than antibonding electrons?
(a) Sketch the molecular orbitals of the H2– ion and draw its energy-level diagram. (b) Write the electron configuration of the ion in terms of its MOs. (c) Calculate the bond order in H2-. (d) Suppose that the ion is excited by light, so that an electron moves from a lower-energy to a higher-energy molecular orbital. Would you expect the excited-state H2- ion to be stable? (e) Which of the following statements about part (d) is correct: (i) The light excites an electron from a bonding orbital to an antibonding orbital, (ii) The light excites an electron from an antibonding orbital to a bonding orbital, or (iii) In the excited state there are more bonding electrons than antibonding electrons?
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Related questions
A molecular orbital diagram for beryllium (Be) is shown. Will beryllium exist as a molecule according to molecular orbital theory?
| Yes | No |
Because:
a. Electrons in bonding orbitals make the species more stable and electrons in antibonding orbitals make the species less stable.
b. Electrons in bonding orbitals make the species less stable and electrons in antibonding orbitals make the species more stable.
c. There is a net stabilization and the system is lower in energy when electrons are in the molecular orbitals than when they are in their individual atomic orbitals.
d. The stabilization from the electrons in bonding molecular orbitals is cancelled out by the destabilization caused by the electrons filling the antibonding molecular orbitals.
