Answer
$^{31}_{15}P$
Work Step by Step
15 is atomic number of Phosphorus.
Mass = protons + neutrons = 15+16 = 31
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 4.5 - Isotopes and Atomic Mass - Questions and Problems - Page 114: 4.33a
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