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Since they have the same number of protons, the mass number varies based on the number of neutrons. After all, the mass number is equal to the number of protons plus the number of neutrons.
Chemistry: The Molecular Science (5th Edition)
by Moore, John W.; Stanitski, Conrad L.
Published by
Cengage Learning
ISBN 10:
1285199049
ISBN 13:
978-1-28519-904-7
Chapter 2 - Chemical Compounds - Questions for Review and Thought - Review Questions - Page 90a: 4b
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