Question

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Explanation:

Identify the components of isotope notation

$$ {}_{Z}^{A}\text{X} $$

• \(A\) represents the mass number (total number of protons and neutrons).
• \(Z\) represents the atomic number (number of protons).
• \(\text{X}\) represents the chemical symbol of the element.

Label the parts indicated by the arrows

• The arrow pointing to \(A\) corresponds to the mass number.
• The arrow pointing to \(Z\) corresponds to the atomic number.
• The arrow pointing to \(\text{X}\) corresponds to the element symbol.

Answer:

• A: Mass number
• Z: Atomic number
• X: Element symbol