Answer
Iodine must gain one electrons when it forms an ion.
Work Step by Step
Iodine is in group seven, meaning that it has 7 valence electrons. It must gain one to achieve noble gas configuration.
Chemistry: An Introduction to General, Organic, and Biological Chemistry (12th Edition)
by Timberlake, Karen C.
Published by
Prentice Hall
ISBN 10:
0321908449
ISBN 13:
978-0-32190-844-5
Chapter 6 - Section 6.1 - Ions: Transfer of Electrons - Questions and Problems - Page 171: 6.2d
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