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

  • question_answer
      On the basis of the number of protons, neutrons and electrons in the samples given below identify (i) the cation (ii) the pair of isobars, and (iii) the pair of isotopes
    Element Protons Neutrons Electrons
    A 17 18 16
    B 18 19 18
    C 17 20 17
    D 17 17 17
    (i)Sample A has more protons than the electrons. Hence, it is a cation,                   (ii) Sample B and C have same mass number but different atomic numbers. Hence, they are a pair of isobars,                         (iii) Samples C and D have same atomic number but different mass numbers. Hence, they are a pair of isotopes,

    Answer:



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