Answer
The correct answer is (a)
Work Step by Step
The calcium ion has a +2 charge, and the sulfide ion has a -2 charge. To balance the charges, one atom of calcium reacts with one atom of sulfur to form $CaS$. So, the correct answer is (a).
Chemistry: Molecular Approach (4th Edition)
by Tro, Nivaldo J.
Published by
Pearson
ISBN 10:
0134112830
ISBN 13:
978-0-13411-283-1
Chapter 3 - Self-Assessment Quiz - Page 127: Q3
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