Even among atoms of the same element, the number of neutrons might vary. Atoms of the same element that have different numbers of neutrons but the same number of protons are called isotopes.
The only difference between identical chemical element atoms of various isotopes is the amount of neutrons in the nucleus.
Isotopes are variations in the mass number, "A," of an element's atoms that share the same number of protons (atomic number, "Z") but a different number of neutrons. Consider hydrogen as an example. It has the isotopes 1H, 2H, and 3H in its naturally occurring form.
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