Answer
$^{16}_{8}X, ^{17}_{8}X,^{18}_{8}X$
Work Step by Step
These atoms are isotopes of oxygen, which has 8 protons.
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: 4.73b
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