Answer
B
Work Step by Step
$O_2^-$ has 13 valence electrons:
$[core]\ (\sigma_{2s})^2\ (\sigma_{2s}^*)^2\ (\sigma_{2p})^2\ (\sigma_{2p}^*)^2\ (\pi_{2p})^4\ (\pi_{2p}^*)^1$
HOMO: highest occupied molecular orbital, that's $\pi_{2p}^*$
Chemistry and Chemical Reactivity (9th Edition)
by Kotz, John C.; Treichel, Paul M.; Townsend, John R.; Treichel, David A.
Published by
Cengage Learning
ISBN 10:
1133949649
ISBN 13:
978-1-13394-964-0
Chapter 9 Bonding and Molecular Structure: Orbital Hybridization and Molecular Orbitals - 9-3 Molecular Orbital Theory - Review & Check for Section 9-3 - Page 365: 2
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