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 - Exercises - Page 75: 2.23c

Answer

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, 118Sn and 120Sn 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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