Answer
C
Work Step by Step
$Cr^{3+}: [Ar]\ 3d^{3}$ 3 unpaired
$Cu^{2+}: [Ar]\ 3d^{9}$ 1 unpaired
$Co^{3+}: [Ar]\ 3d^{6}$ 4 unpaired
$Ni^{2+}: [Ar]\ 3d^{8}$ 2 unpaired
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 7 The Structure of Atoms and Periodic Trends - 7-4 Electron Configurations of Ions - Review & Check for Section 7-4 - Page 267: 2
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