Answer
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Work Step by Step
This assumption is not valid, because there are several isotopes of one element which have different number of neutron in their nucleus so they have different mass.
Chemistry: Atoms First (2nd Edition)
by Zumdahl, Steven S.; Zumdahl, Susan A.
Published by
Cengage Learning
ISBN 10:
1305079248
ISBN 13:
978-1-30507-924-3
Chapter 1 - Active Learning Questions - Page 51a: 9
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