Answer
$^{39}K$
Work Step by Step
Potassium's atomic weight is 39.098 g/mol, which is closer to 39 than 41; therefore, the $^{39}K$ isotope must be more abundant.
Chemistry and Chemical Reactivity (9th Edition)
by Kotz, John C.; Treichel, Paul M.; Townsend, John R.; Treichel, David A.
Published by
Cengage Learning
ISBN 10:
1133949649
ISBN 13:
978-1-13394-964-0
Chapter 2 Atoms, Molecules, and Ions - Study Questions - Page 95e: 98
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