Answer
Some metal ions can have variable valency. Such as Copper can have valency of +1 and +2 and is written as Copper (I) and Copper (II) respectively.
Work Step by Step
Explained above
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 6.5 - Molecular Compounds: Sharing Electrons - Figure 6.6 - Page 187: 1
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