Q:
      
      
         
            
There are two elements-calcium (atomic number 20) and argon (atomic number 18). The mass number of both the elements is 40. They are therefore known as
         
       
      
      
      
          
      
      
          Answer & Explanation
         Answer: C) isobars         
         
Explanation: Isotopes-These  are  atoms  of  the elements  having  the  same  atomic number but different mass number.,  Isobars-These  are atoms of same mass number but different atomic  number.,  Isotones-These are  atoms  of  different  elements having same number of neutrons.
       
      
      
      
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