Problem: You may want to reference (Pages 369 - 371) Section 9.7 while completing this problem.The following is part of a molecular orbital energy-level diagram for MOs constructed from 1s atomic orbitals.For which of the following molecules or ions could this be the energy-level diagram: H2, He2, H2+, He2+, or H2–?

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You may want to reference (Pages 369 - 371) Section 9.7 while completing this problem.
The following is part of a molecular orbital energy-level diagram for MOs constructed from 1s atomic orbitals.

An energy-level diagram; the higher orbital is vacant while the lower orbital has one electron in it.
For which of the following molecules or ions could this be the energy-level diagram: H2, He2, H2+, He2+, or H2–?

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