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: 2.69e

Answer

Cation Name: Chromium (II) Cation Charge: 3+ Anion Name: Hydroxide Anion Charge: 1-

Work Step by Step

Since Chromium has more than one ionic charge, we will start with the anion. The anion is the Hydroxide ion OH$^{-}$. It has a 1- charge. But since there are three Hydroxide ions in the compound, there is 3- charge from the negatively charged ions. In order for the compound to have a net neutral charge, the chromium atom must have a 3+ charge, making it Chromium (III).
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