Answer
$^{39}_{19}$K, $^{40}_{19}$K, and $^{41}_{19}$K are the symbols for the isotopes (respectively).
Work Step by Step
An atomic symbol has the mass number placed over the atomic number followed by the element's symbol.
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: 5.3a
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