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it depends because isotopes have different nucleon numbers but their atomic number stays the same.
The nucleon numbers 35 and 12 represent the relative isotopic mass of the isotopes. So, chlorine-35 is about three times heavier compared to carbon-12. You can see all the (average) atomic masses of the elements in the periodic table.
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Elements with atomic numbers 89-94: natural elements.Elements with atomic numbers 95-98: artificial elements but they are also discoverd in nature as ultratraces.Elements with atomic numbers 99-103: artificial elements.
The graph of mass per nucleon vs atomic mass number typically shows an increasing trend up to iron (Fe-56), where nuclear binding energy is maximized. Nuclei with atomic numbers lower than iron release energy in fusion, while those higher than iron release energy in fission. Beyond iron, the graph slopes downward due to the increasing energy required to overcome the electrostatic repulsion of protons.