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

  • question_answer
    An element \[X\] forms a un-positive ion with the electronic structure\[2,\,\,8,\,\,8\]. What is the atomic number of\[X\]?

    A) \[16\]                

    B)        \[17\]

    C) \[18\]                

    D)        \[19\]  

    Correct Answer: D

    Solution :

     A unipositive ion (cation) is formed when a metal loses its outer electrons to form a table electronic configuration \[2,\,\,8,\,\,8,\,\,1\] i.e.\[,\]\[Z=19\]. It can lose its valence electron during a chemical reaction to form ion\[,\]\[{{X}^{+}}\], which has an electronic configuration of\[2,\,\,8,\,\,8\].


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