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9th Class Science Structure of the Atom

  • question_answer 32)
    Number of valence electrons in Cl- ion are : (a) 16              (b) 8               (c) 17              (d) 18  

    Answer:

    (b) Electronic configuration of Cl (Z = 17) = 2,8,7. Thus, it has 7 valence electrons. Cl  gains 1 electron to form Cl- ion. So, number of valence electrons =7+1=8.


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