#### 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).

Published by
Pearson

ISBN 10:
0134112830

ISBN 13:
978-0-13411-283-1

The correct answer is (a)

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