Chemistry: An Introduction to General, Organic, and Biological Chemistry (12th Edition)

Published by Prentice Hall
ISBN 10: 0321908449
ISBN 13: 978-0-32190-844-5

Chapter 6 - Section 6.4 - Polyatomic Ions - Figure 6.4 - Page 181: 1

Answer

If a metal ion can have multiple valencies such as Iron (can have two valencies +2 and +3), its name in compounds is written followed by number in roman numerals to indicate its valency. Like Iron(II) oxide and Iron (III) oxide

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