Chemistry: The Central Science (13th Edition)

Published by Prentice Hall
ISBN 10: 0321910419
ISBN 13: 978-0-32191-041-7

Chapter 2 - Atoms, Molecules, and Ions - Exercises - Page 75: 2.32

Answer

Have the same number of protons, but different number of neutrons.

Work Step by Step

129Xe and 130Xe differ in their mass number (the superscript), which is the total amount of protons + neutrons. However, they have the same number of protons because they are the same element. Therefore, they differ in their number of neutrons.
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