Question

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in what ways are isotopes alike? in what ways are they different?
isotopes contain the same number of neutrons. isotopes have different numbers of and thus different atomic masses.
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Explanation:

Isotopes are atoms of the same element. They have the same number of protons which defines the element. But they have different numbers of neutrons, leading to different atomic masses.

Answer:

Isotopes contain the same number of protons. Isotopes have different numbers of neutrons and thus different atomic masses.