Answer
Please see the work below.
Work Step by Step
We know that the ionic radii increases as we move down the group in periodic table due to extra electron shells. Hence $Mg^{+2}$ has the smallest ionic radius of the three.
General Chemistry 10th Edition
by Ebbing, Darrell; Gammon, Steven D.
Published by
Cengage Learning
ISBN 10:
1-28505-137-8
ISBN 13:
978-1-28505-137-6
Chapter 9 - Ionic and Covalent Bonding - Exercises - Page 345: 9.6
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