Chemistry 12th Edition

Published by McGraw-Hill Education
ISBN 10: 0078021510
ISBN 13: 978-0-07802-151-0

Chapter 2 - Atoms, Molecules, and Ions - Questions & Problems: 2.68

Answer

Please see the work below.

Work Step by Step

We know that the mass number -neutrons=protons that is $127-74=53$. As the iodine has 54 electrons one more than that the number of protons hence it is represented as $I^-$.
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