Answer
The atomic number would be used.
Work Step by Step
In a neutral atom, the number of electrons is equal to the number of protons. The number of protons is equal to the atomic number.
Chemistry: An Introduction to General, Organic, and Biological Chemistry (12th Edition)
by Timberlake, Karen C.
Published by
Prentice Hall
ISBN 10:
0321908449
ISBN 13:
978-0-32190-844-5
Chapter 4 - Section 4.4 - Atomic Number and Mass Number - Questions and Problems - Page 111: 4.23d
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