Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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![**Question 4: Which is a pair of isotopes?**
a.
\[ \begin{align*}
^{238}_{92}\text{U} & \quad \text{and} \quad ^{238}_{93}\text{Np}
\end{align*} \]
b.
\[ \begin{align*}
^{59}_{27}\text{Co} & \quad \text{and} \quad ^{60}_{27}\text{Co}
\end{align*} \]
c.
\[ \begin{align*}
^{27}_{13}\text{Al} & \quad \text{and} \quad ^{27}_{14}\text{Si}
\end{align*} \]
d.
\[ \begin{align*}
^{39}_{19}\text{K} & \quad \text{and} \quad ^{40}_{20}\text{Ca}
\end{align*} \]
**Explanation:**
To determine which option shows isotopes, recall that isotopes are atoms of the same element (i.e., same number of protons) that have different numbers of neutrons. Consequently, isotopes have the same atomic number but different mass numbers.
In option b, both atoms have the atomic number 27 (which corresponds to Cobalt, Co) but different mass numbers (59 and 60). This indicates that they are isotopes of Cobalt.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F879c0352-5b80-42ec-a0ea-af6394ccb633%2F5c36e22a-5eb1-47de-98de-b7628f299683%2F0s0896o_processed.jpeg&w=3840&q=75)
Transcribed Image Text:**Question 4: Which is a pair of isotopes?**
a.
\[ \begin{align*}
^{238}_{92}\text{U} & \quad \text{and} \quad ^{238}_{93}\text{Np}
\end{align*} \]
b.
\[ \begin{align*}
^{59}_{27}\text{Co} & \quad \text{and} \quad ^{60}_{27}\text{Co}
\end{align*} \]
c.
\[ \begin{align*}
^{27}_{13}\text{Al} & \quad \text{and} \quad ^{27}_{14}\text{Si}
\end{align*} \]
d.
\[ \begin{align*}
^{39}_{19}\text{K} & \quad \text{and} \quad ^{40}_{20}\text{Ca}
\end{align*} \]
**Explanation:**
To determine which option shows isotopes, recall that isotopes are atoms of the same element (i.e., same number of protons) that have different numbers of neutrons. Consequently, isotopes have the same atomic number but different mass numbers.
In option b, both atoms have the atomic number 27 (which corresponds to Cobalt, Co) but different mass numbers (59 and 60). This indicates that they are isotopes of Cobalt.
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