Answer
$Ca^{2+}$
Work Step by Step
Both of these atoms have the same number of electrons. However, $Ca^{2+}$ has more protons pulling these electrons in, so it is smaller.
Chemistry: The Molecular Science (5th Edition)
by Moore, John W.; Stanitski, Conrad L.
Published by
Cengage Learning
ISBN 10:
1285199049
ISBN 13:
978-1-28519-904-7
Chapter 5 - Electron Configurations and the Periodic Table - Questions for Review and Thought - Topical Questions - Page 240c: 85e
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