Question

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

Explanation:

Step1: Recall isotopic notation

Isotopic notation is $\ce{^{A}_{Z}X}$, where $Z$ is the atomic number and $A$ is the mass - number, and $X$ is the chemical symbol.

Step2: Identify the element for $Z = 29$

The atomic number $Z = 29$ corresponds to copper, with the symbol $\ce{Cu}$.

Step3: Write the isotopic notation

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

Answer:

$\ce{^{65}_{29}Cu}$