Answer
$Cr^{+2}$
Work Step by Step
Here Oxygen has -2 charge and there is 1 atom of Oxygen So charge on Chromium must be +2 to balance the -2 charge of Oxygen.
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: 6.22b
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