Answer
An atom is copper if and only if it has 29 protons (see the periodic table). The mass number is the total number of protons and neutrons, so this is Cu-63.
Work Step by Step
Answers may be found in the periodic table on page 216.
Conceptual Physics (12th Edition)
by Hewitt, Paul G.
Published by
Addison-Wesley
ISBN 10:
0321909100
ISBN 13:
978-0-32190-910-7
Chapter 11 - Think and Explain - Page 224-225: 46
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