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: 2.70a

Answer

Copper (II) is a cation with a +2 charge. Sulfide is an anion, with a -2 charge.

Work Step by Step

There is no overall charge on the compound, Thus the charges are balanced. Sulfide has a -2 charge, therefore in order to balance charges, copper has a +2 charge making it 'Copper (II)'. Also, Sulfur can gain 2 electrons, making it a sulfide anion and thus, copper can loose 2 electrons from its outer most shell making it a copper (II) cation.
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