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: 2.23b


Yes, they are isotopes.

Work Step by Step

Isotopes are atoms with the same number of PROTONS but different number of NEUTRONS. The two shown, 55Mn and 54Mn are the same element and therefore have the same number of protons, but they have different mass numbers (protons + neutrons), so they have different number of neutrons.
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