With respect to the three fundamental particles of atoms, which particles have the same number between two isotopes of the same element, and which ones are
different?

Protons and electrons would stay the same, neutrons do not

Explanation:

You can't change the number of protons without changing its element. Isotopes are variations of an atom with different numbers of neutrons, so they must be different. It doesn't say that it's also an ion, so electrons probably stay the same.

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