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

  • question_answer
    Electron distribution of two elements P and Q in their outermost shell is shown below.
     
    Atomic numbers of P and Q are respectively
       

    A) 9, 17               

    B) 15, 17 

    C) 24, 17 

    D) 17, 24

    Correct Answer: C

    Solution :

    Electron configuration of P :
    K L M N
    2 8 8 6
     
    So, its atomic number = 24
    Electronic configuration of Q :
     
    K L M N
    2 8 7  
      So, its atomic number = 17


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