Which description fits an ion?

Answer and explanation

Correct answer: D. is an atom that has gained or lost electrons

An ion is an atom that has gained or lost electrons.
Answer: is an atom that has gained or lost electrons.
Why not the others: is an atom of the same element with a different number of neutrons: that describes an isotope. has a positive charge and is found in the nucleus: that describes a proton. has a negative charge and moves around the nucleus: that describes an electron.

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