Answer
See the answer below.
Work Step by Step
a) $Si_2^-$ has 9 valence electrons:
$[core]\ (\sigma_{3s})^2\ (\sigma_{3s}^*)^2\ (\pi_{3p})^4\ (\sigma_{3p})^1$
b) It's paramagnetic because it has one unpaired electron.
c) $\sigma_{3p}$
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 - Study Questions - Page 369c: 42
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