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  3. 9th Class
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  5. Structure of the Atom

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

  • question_answer
    Description of a few atoms is given in the table.
    Atom P Q R S
    No. of protons 17 11 17 9
    No. of neutrons 18 12 20 10
    No. of electrons 17 10 17 10
    Identify a cation, an anion and a pair of isotopes from the given table.

    A)
    Cation Anion Pair of isotopes
    P Q P, Q

    B)
    Cation Anion Pair of isotopes
    Q S P, R

    C)
    Cation Anion Pair of isotopes
    R P R, S

    D)
    Cation Anion Pair of isotopes
    Q S Q, S

    Correct Answer: B

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