Answer
$^{40}_{18}Ar$
Work Step by Step
Atomic number of argon (A) = 18
Number of neutrons = 22
So, mass number of argon isotope (Z) = 22 + 18 = 40
Hence, isotopic symbol = $^{40}_{18}Ar$
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: 52d
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