Answer
$Ba^{2+}$
Work Step by Step
Cations always have a smaller radius than the original atom, for the smaller number of electrons leads to less repulsion in the outer electron cloud. Thus, we find that $Ba^{2+}$ will be 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: 85d
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