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Chemistry 18 Online
OpenStudy (anonymous):

An element has two different isotopes. How do the two isotopes differ? The atoms of each isotope have a different number of protons. The atoms of each isotope are negatively charged ions. The atoms of each isotope have a different number of electrons. The atoms of each isotope have a different number of neutrons.

OpenStudy (cuanchi):

The atoms of each isotope have a different number of neutrons.

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