JEE Main & Advanced Sample Paper JEE Main - Mock Test - 31

  • question_answer
    The electronic configuration of an element is \[1{{s}^{2}}2{{s}^{2}}2{{p}^{6}}3{{s}^{2}}3{{p}^{3}}\]. What is the atomic number of the element, which is just below the above element in the periodic table?

    A) 33        

    B)                    34

    C) 36                    

    D)        49

    Correct Answer: A

    Solution :

    Atomic number of the given element is 15 and it belongs to 5th group. Therefore atomic number of the element below the above element \[=15+18=33.\]


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