Answer
Z (the atomic number) is the number of protons in an atom's nucleus while A (the mass number) is the number of protons and neutrons in an atom.
Work Step by Step
Z defines the element, A indicates its mass.
Chemistry: A Molecular Approach (3rd Edition)
by Tro, Nivaldo J.
Published by
Prentice Hall
ISBN 10:
0321809246
ISBN 13:
978-0-32180-924-7
Chapter 2 - Sections 2.1-2.9 - Exercises - Review Questions - Page 79: 15
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