Campbell Biology: Concepts & Connections (9th Edition)

Published by Pearson
ISBN 10: 0-13429-601-X
ISBN 13: 978-0-13429-601-2

Chapter 2 - Review: 13

Answer

A) the number of protons in the atom

Work Step by Step

The mass number = the number of protons in the atom. These numbers are unique to each element.
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