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9th Class Science Structure of the Atom Question Bank 9th CBSE Science Structure of the Atom

  • question_answer
      Why is atomic mass of chlorine taken as 35.5 u and not a whole number like 35 u or 3 6 u? Explain.     

    Answer:

      Chlorine in natural state comprises two isotopes of atomic masses 35 u and 37 u in the ratio 3:1. Hence, the atomic mass of chlorine is taken as the average of atomic masses of two isotopes. Thus, average atomic mass =


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