Biology 2010 Student Edition

Published by Prentice Hall
ISBN 10: 9780133669510
ISBN 13: 978-0-13366-951-0

Chapter 2, The Chemistry of Life - 2.1 - The Nature of Matter - 2.1 Assessment - Page 38: 2a

Answer

Isotopes have the same number of protons and electrons. Differing numbers of neutrons differentiate isotopes.

Work Step by Step

A different number of neutrons will result in a different atomic mass, causing there to be multiple different isotopes.
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