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

  • question_answer
    Identify the \[A{{l}^{3+}}ion\] from the given structures.

    A) I                      

    B)        II         

    C) III                    

    D)        IV

    Correct Answer: D

    Solution :

    \[_{13}^{27}Al\] has atomic number 13 and mass number 27. Atomic number = Number of protons =13 and Mass number = Number of protons + number of neutrons Number of neutrons = 27 - 13 = 14 \[\text{A}{{\text{l}}^{\text{3-}}}\] has 10 electrons. Hence, structure IV represents \[\text{A}{{\text{l}}^{\text{3-}}}\]ion.


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