The neutral atom's two isotopes differ in the number of:
A. Electron shells B. Protons C. Valence electrons D. Neutrons
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Neutral atoms have the same number of electrons and protons. Atoms of an element that contain different numbers of neutrons are called isotopes. Each isotope of a given element has the same atomic number but a different mass number (A), which is the sum of the numbers of protons and neutrons.
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