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An isotope of a chemical element is defined at the atomic level by its number of:
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neutrons |
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electrons |
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ions |
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protons |
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ortbital shells |
Explanation
An isotope of a chemical element is defined by its number of neutrons, whereas the chemical element itself is defined by its number of protons. For example, any atom having 6 protons is an atom of carbon, and the number of neutrons it has determines which isotope of carbon it is.
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