Answer
Hydrogen, with one proton in its nucleus, has the lightest atoms.
Work Step by Step
This is discussed on page 214.
Conceptual Physics (12th Edition)
by Hewitt, Paul G.
Published by
Addison-Wesley
ISBN 10:
0321909100
ISBN 13:
978-0-32190-910-7
Chapter 11 - Reading Check Questions (Comprehension) - Page 223-224: 13
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