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JEE Main & Advanced Sample Paper JEE Main Sample Paper-3

  • question_answer
    An atom X belongs to 4th period of the periodic table and has highest number of unpaired electrons in comparison to the other elements of the period. The atomic number of X is

    A)  23                         

    B)  25

    C)  24                         

    D)  33

    Correct Answer: C

    Solution :

     The configuration of atom of 4th period with maximum unpaired electrons is 1s2 2s2 2p6 3s2 3p6 3d5 4s1.  8. Hence its atomic number is 24.


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