Answer
Eu has 63 protons and 89 neutrons
Work Step by Step
The mass number less the number of protons equals the number of neutrons.
Chemistry: The Central Science (13th Edition)
by Brown, Theodore E.; LeMay, H. Eugene; Bursten, Bruce E.; Murphy, Catherine; Woodward, Patrick; Stoltzfus, Matthew E.
Published by
Prentice Hall
ISBN 10:
0321910419
ISBN 13:
978-0-32191-041-7
Chapter 2 - Atoms, Molecules, and Ions - Additional Exercises - Page 78: 2.92c
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