Answer
$Cl^-$
Work Step by Step
Anions have more electrons than the original atom. Thus, there will be more repulsion in anions, meaning that $Cl^-$ will have a larger radius than Cl.
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 240d: 86a
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