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

  • question_answer
      Complete the following table.
    Element Atomic number Proton Electron Neutron Mass number
    A B C 17   14 9 17 14 9 18 14     19

    Answer:

                (i) Electronic configuration of sulphur (S):  Oxygen (0) : 2, 6   (ii) Valency of both sulphur and oxygen is 2.        (iii) No, they are not isotopes as their atomic numbers are different. Since, isotopes are the elements having the same atomic number but different mass number.     


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