## Chemistry: A Molecular Approach (3rd Edition)

Published by Prentice Hall

# Chapter 8 - Sections 8.1-8.9 - Exercises - Problems by Topic: 69b

#### Answer

$I^{-}$

#### Work Step by Step

$I^{-}$ and $Cs^{+}$ are isoelectronic, meaning that they have the same number of electrons. However, $I^{-}$ have two fewer protons than $Cs^{+}$, resulting in a lesser pull on the electrons and therefore a larger radius.

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