Biology 2010 Student Edition

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

Chapter 2, The Chemistry of Life - Standardized Text Prep - Page 59: 5



Work Step by Step

Isotopes are forms of the same element with differing numbers of neutrons. In isotopes, the number of protons and electrons remain the same. Because the number of neutrons differ between isotopes, the mass number is also different because the mass number is the number of protons plus the number of neutrons in an atom. Therefore, option D is correct because isotopes differ in the number of neutrons they contain as well as in their mass numbers.
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