Chemistry (4th Edition)

Published by McGraw-Hill Publishing Company
ISBN 10: 0078021529
ISBN 13: 978-0-07802-152-7

Chapter 1 - Questions and Problems: 1.17

Answer

(a) and (d) are elements. (b) and (c) are compounds.

Work Step by Step

Elements consists of only one type of particles.Different elements combine to form compounds. In diagram (a) and (d), there is only one type of particles.Hence they are elements. Other two are compounds since they are made up of different elements.
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