Answer
Neutrons
Work Step by Step
This is equal to the number of protons plus neutrons minus the number of protons. Hence this is defined by the number of neutrons.
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 4.7 - Trends in Periodic Properties - Understanding the Concepts - Page 129: 4.71e
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