Answer
$Au^{+3}$
Work Step by Step
Here Cl has -1 charge and there are three atoms of chlorine. So charge on Gold must be +3 to balance the -3 charge of 3 Cl atoms.
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 6.3 - Naming Ionic Compounds - Questions and Problems - Page 177: 6.21a
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