why are isotopes not present in the modern periodic table
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Because modern periodic table is arranged according to the atomic number of the elements. Whereabout isotopes have same atomic number (but different atomic mass). And that's why isotopes don't occupy an indiviual position in periodic table.
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The periodic table is arranged by number of protons/electrons which is the same for all isotopes of anelement. A different isotope will have a different number of neutrons only, which does not qualify it for a separate space on the periodic table.
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