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 - Additional Exercises - Page 79: 2.104c

Answer

chromium (III) oxide +3

Work Step by Step

$Cr_2O_3$ $Cr$ is chromium. $O$ is oxygen, which his called oxide when naming compounds. Oxygen has a charge of -2. The compound is neutral, so the charge/oxidation number of the manganese element was +3. (The 3 oxygen atoms contributed a -6 charge, which must be offset by a +6 charge from the chromium. There are 2 chromium atoms, so +3 each.) The name is written as element(oxidation number) element so $Cr_2O_3$ is chromium (III) oxide.
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