Question

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what letters are used to designate atomic number and mass number in isotopic notation of atoms?
isotopic notation: $_{z}^{a}e$
represents the atomic number.
represents the mass number.
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Explanation:

In isotopic notation $\ce{_{Z}^{A}E}$, by convention, the sub - script $Z$ represents the atomic number (number of protons) and the superscript $A$ represents the mass number (sum of protons and neutrons).

Answer:

$Z$ represents the atomic number.
$A$ represents the mass number.