Answer
Though a uranium atom is heavier than an iridium atom, uranium atoms are not packed as closely as iridium atoms are. Uranium is less dense than iridium.
Work Step by Step
This is discussed on page 230.
Conceptual Physics (12th Edition)
by Hewitt, Paul G.
Published by
Addison-Wesley
ISBN 10:
0321909100
ISBN 13:
978-0-32190-910-7
Chapter 12 - Think and Discuss - Page 243: 83
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