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Three pairs of elements that are not ordered by Atomic Mass are: potassium (K, atomic mass ~39.1) and argon (Ar, atomic mass ~39.9), where potassium comes before argon in the Periodic Table; cobalt (Co, atomic mass ~58.9) and nickel (Ni, atomic mass ~58.7), where cobalt is placed before nickel; and iodine (I, atomic mass ~126.9) and tellurium (Te, atomic mass ~127.6), where iodine precedes tellurium. These examples highlight instances where the arrangement of elements does not strictly follow increasing atomic mass.

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