Answer
The number of neutrons is different by 3.
Work Step by Step
Difference in mass number of an element = difference in the number of neutrons = 238-235 = 3
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 - Topical Questions - Page 90a: 18
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