Q:
      
      
         
            
According to the modern Periodic Law, the properties of elements are periodic functions of their
         
       
      
      
      
          
      
      
          Answer & Explanation
         Answer: D) atomic number         
         
Explanation: Atomic number is the serial number of an element in the periodic classification of elements. It gives the number of protons and also the number of electrons in an atom.
       
      
      
      
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