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

  • question_answer
    Identify the number of electrons present in the outermost shell of atoms of each of the following elements.

    A)  (i) - 2, (ii) - 3, (iii) ? 4

    B)  (i) - 1, (ii) - 4, (iii) ? 6

    C)  (i) - 2, (ii) - 2, (iii) ? 6  

    D)  (i) - 3, (ii) - 4, (iii) ? 5

    Correct Answer: C

    Solution :

    \[He-2,\,\,Mg-2,\,\,8,\,\,2\,\,S-2,\,\,8,\,\,6\] \[\therefore \]\[2,\,\,2,\,\,6\]are the number of valence electrons present in \[He,\,\,Mg\] and \[S\] respectively.


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