Chemistry: A Molecular Approach (3rd Edition)

Published by Prentice Hall
ISBN 10: 0321809246
ISBN 13: 978-0-32180-924-7

Chapter 2 - Sections 2.1-2.9 - Exercises - Review Questions: 15

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.
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