Answer
Each aluminum atom is less massive than a lead atom. More aluminum atoms are needed to have a mass of 1 kilogram.
Conceptual Physics (12th Edition)
by Hewitt, Paul G.
Published by
Addison-Wesley
ISBN 10:
0321909100
ISBN 13:
978-0-32190-910-7
Chapter 11 - Think and Discuss - Page 225: 65
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