1. History of the Periodic Table
   
   1. a) Who is credited with developing a method that led to the determination of standard relative atomic masses?
      b) Who discovered the periodic law?
      c) Who established atomic numbers as the basis for organizing the periodic table?
      
   2. Name three sets of elements added to the periodic table after Mendeleev's time.
      
   3. How is the periodic law demonstrated within the groups of the periodic table?
      

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