Answer
Both Br and Cl has most common ionic charge of -1.
Work Step by Step
Both belong to G-VIIA, hence they have the same common ionic charges.
Chemistry: The Central Science (13th Edition)
by Brown, Theodore E.; LeMay, H. Eugene; Bursten, Bruce E.; Murphy, Catherine; Woodward, Patrick; Stoltzfus, Matthew E.
Published by
Prentice Hall
ISBN 10:
0321910419
ISBN 13:
978-0-32191-041-7
Chapter 7 - Periodic Properties of the Elements - Exercises - Page 294: 7.73b
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