Answer
A
Work Step by Step
The atomic weight of copper is 63.546u, which is closer to 63 than 65, so the $^{63}Cu$ isotope is 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 - 2-4 Atomic Weights - Review & Check for Section 2-4 - Page 52: 1
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