Answer
2
Work Step by Step
It is the same element, so if the mass number differs by 2, the number of neutrons must differ by 2 as well.
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: 19
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