Chemistry: The Central Science (13th Edition)

Published by Prentice Hall
ISBN 10: 0321910419
ISBN 13: 978-0-32191-041-7

Chapter 2 - Atoms, Molecules, and Ions - Exercises - Page 77: 2.73e



Work Step by Step

Mercury can have a variety of different charges. However, the textbook specifies that it is Mercury (II). The (II) indicates that this Mercury ion has a charge of 2+. Bromine is located one group to the left of the noble gases, meaning that it has a charge of 1-. In order for the charges of the ions to cancel each other out, there must be two Bromine ions for every one Mercury ion. Because metals come before non-metals in chemical formulas, the chemical formula for Mercury (II) Bromide is $HgBr_2$.
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