Answer
$^{35}Cl$ is more abundant. We know that because the atomic mass of chlorine is about 35.45, which is closer to 35 than 37.
Work Step by Step
According to the periodic table, the atomic weight of chlorine is 35.45.
Chemistry: Atoms First (2nd Edition)
by Zumdahl, Steven S.; Zumdahl, Susan A.
Published by
Cengage Learning
ISBN 10:
1305079248
ISBN 13:
978-1-30507-924-3
Chapter 5 - Active Learning Questions - Page 240b: 13
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