Chemistry (7th Edition)

Published by Pearson
ISBN 10: 0321943171
ISBN 13: 978-0-32194-317-0

Chapter 2 - Atoms, Molecules, and Ions - Section Problems - Page 74: 106


The second naturally occurring isotope of $Cu$ is $^{63} Cu$.

Work Step by Step

Looking on the periodic table, we can see that the weight for copper is equal to "63.5". If the isotopes are $^{63} Cu$. and $^{65} Cu$, the average weight for copper is between 63 and 65. If the isotopes are $^{65} Cu$ and $^{66} Cu$, that will be between 65 and 66. Since the periodic table weight is "63.5", which is between 63 and 65, the isotopes are $^{63} Cu$. and $^{65} Cu$.
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