2. Questions Bank
  3. 9th Class
  4. Science
  5. Structure of the Atom

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

  • question_answer
    The atomic numbers of three elements \[P,\,\,Q\] and \[R\] are \[5,\,\,9\] and \[13\] respectively. Which two elements show similar chemical properties?

    A)  \[P\]and\[Q\]                            

    B)  \[P\] and \[R\]  

    C)  \[Q\]and\[R\]                

    D)         \[P,\,\,Q\]and\[R\]

    Correct Answer: B

    Solution :

     The electronic configuration of elements. \[P\to 2,\,\,3\]     \[Q\to 2,\,\,7\]    \[R\to 2,\,\,8,\,\,3\] Elements \[P\] and \[R\] have the same number of valence electrons. Hence, they show the same chemical properties.


You need to login to perform this action.
You will be redirected in 3 sec spinner