Which statements describe isotopes? Check all that apply.Isotopes of the same element have the same number of protons.Isotopes of the same element have the same number of neutrons.All isotopes are unstable.Some isotopes are unstable.Isotopes are identified by their mass number.Isotopes are identified by their atomic number.

Isotopes are atoms of the same element, so they have the same number of protons. They differ in their number of neutrons, which gives them different mass numbers; isotopes are distinguished by their mass number. Some isotopes are unstable, but not all are, so the correct statements are that some isotopes are unstable and that isotopes are identified by mass number.

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