Answer
$Ca^{2+}$
Work Step by Step
$Ca^{2+}$ has the same electronic configuration as [Ar], while other ions have the electronic configuration of [Ne].
Chemistry: Principles and Practice (3rd Edition)
by Reger, Daniel L.; Goode, Scott R.; Ball, David W.
Published by
Cengage Learning
ISBN 10:
0534420125
ISBN 13:
978-0-53442-012-3
Chapter 8 - The Periodic Table: Structure and Trends - Questions and Exercises - Exercises - Page 231: 8.43
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