Answer
The mass number of an isotope is the sum of its protons and neutrons.
Work Step by Step
Every isotope of a substance will have a different mass number but the same atomic number.
Introductory Chemistry (5th Edition)
by Tro, Nivaldo J.
Published by
Pearson
ISBN 10:
032191029X
ISBN 13:
978-0-32191-029-5
Chapter 4 - Atoms and Elements - Exercises - Questions - Page 120: 24
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