Answer
$^{40}_{19}K$
Work Step by Step
Atomic number of potassium (A) = 19
Number of neutrons = 21
So, mass number of potassium isotope (Z) = 21 + 19 = 40
Hence, isotopic symbol = $^{40}_{19}K$
Chemistry: A Molecular Approach (3rd Edition)
by Tro, Nivaldo J.
Published by
Prentice Hall
ISBN 10:
0321809246
ISBN 13:
978-0-32180-924-7
Chapter 2 - Sections 2.1-2.9 - Exercises - Problems by Topic - Page 80: 52c
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