Answer
A
Work Step by Step
Cr: $[Ar]\ 3d^5\ 4s^1$, 6 unpaired
Fe: $[Ar]\ 3d^6\ 4s^2$, 4 unpaired
Mn: $[Ar]\ 3d^5\ 4s^2$, 5 unpaired
Ni: $[Ar]\ 3d^8\ 4s^2$, 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 - 7-3 Electron Configurations of Atoms - Review & Check for Section 7-3 - Page 263: 2
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