The key quantity in identifying an isotope is the number of protons, as it determines the element's identity and plays a vital role in distinguishing isotopes based on their mass numbers.
The most important quantity for determining the identity of an isotope is the number of protons.
This is because the number of protons in the nucleus of an atom is its atomic number, which defines the identity of the element. Isotopes have the same number of protons but differ in the number of neutrons they possess, leading to variations in mass numbers.
The mass number, which is the sum of protons and neutrons, is crucial in identifying isotopes and calculating atomic masses.
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