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 $I^-$.
Chemistry 12th Edition
by Chang, Raymond; Goldsby, Kenneth
Published by
McGraw-Hill Education
ISBN 10:
0078021510
ISBN 13:
978-0-07802-151-0
Chapter 2 - Atoms, Molecules, and Ions - Questions & Problems - Page 70: 2.68
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