Answer
Four monatomic ions that have the same electron configuration as argon are:
$K^+$(Potassium ion) $Ca^{2+}$(calcium ion) $Sc^{3+}$(scandium ion) $Cl^-$(chlorine ion).
Work Step by Step
See above
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 21 The Chemistry of the Main Group Elements - Study Questions - Page 855a: 4
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