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Any of two or more forms of a chemical element, having the same number of protons in the nucleus, or the same atomic number, but having different numbers of neutrons in the nucleus, or different atomic weights.
Wiki User
∙ 13y ago
Wiki User
∙ 12y agoA different neutron count in the same element. Such as the isotopes of carbon. Carbon 12, carbon 13 and carbon 14. All have these various neutron counts that give and average mass of 12.01 grams per mole.
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What is make an atom isotope?
It is the neutron that makes changes in atomic nuclei to change them from one isotope to another. For any given element, that element will have a fixed number of protons. It is, after all, the number of protons that determine the elemental identity. But the number of neutrons in a given element can vary, and we use the term isotope to talk about which particular atom we're investigating. That is, we apply the term isotope to speak to an atom of a given element with a certain number of neutrons in its nucleus.
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