## Chemistry: A Molecular Approach (3rd Edition)

Published by Prentice Hall

# Chapter 2 - Sections 2.1-2.9 - Exercises - Problems by Topic: 52c

#### 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 = $^{40}_{19}K$

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