Question

question 7 of 30
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write isotopic notation symbols for each of the following.
(a) z = 29, a = 65
(b) z = 20, a = 45

Explanation:

Step1: Recall isotopic notation

The isotopic notation is $\ce{^{A}_{Z}X}$, where $Z$ is the atomic number, $A$ is the mass - number, and $X$ is the chemical symbol. For $Z = 29$, the element is copper with symbol $\ce{Cu}$.

Step2: Write the isotopic symbol for (a)

Substitute $Z = 29$ and $A = 65$ into the isotopic notation $\ce{^{A}_{Z}X}$, we get $\ce{^{65}_{29}Cu}$.

Step3: Recall the element for $Z = 20$

For $Z=20$, the element is calcium with symbol $\ce{Ca}$.

Step4: Write the isotopic symbol for (b)

Substitute $Z = 20$ and $A = 45$ into the isotopic notation $\ce{^{A}_{Z}X}$, we get $\ce{^{45}_{20}Ca}$.

Answer:

(a) $\ce{^{65}_{29}Cu}$
(b) $\ce{^{45}_{20}Ca}$