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It might be Iodine and Tellurium because Tellurium has a larger atomic weight than Iodine but Iodine has more similar properties with Fluorine and Chlorine so Mendeleev placed them that way to make more sense but at that point the elements were aranged in order of Atomic Mass. Now the Periodic Table is in order of it's atomic number rather than it's atomic mass so it all fits nicely.

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