Answer
This is Argon-38.
Work Step by Step
Identify the element based on atomic number, and add the atomic mass after it, preceded by a dash.
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 5 - Section 5.1 - Natural Radioactivity - Questions and Problems - Page 138: 5.9d
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