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Atomic number is unique to an element. Since both Chlorine-35 and Chlorine-37 has atomic number of 17, they are both Chlorine. However they have different Atomic Mass (caused by different number of neutrons in the atom) thus they are called isotope.

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Q: Chlorine with mass number-35 and a atomic number-17 and Chlorine with mass number-37 and a atomic number-17 How do they know that they are the same element?
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