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JEE Main & Advanced JEE Main Paper (Held On 10-Jan-2019 Evening)

  • question_answer
    The 71st electron of an element X with an atomic  number of 71 enters into the orbital; [JEE Main Online Paper (Held On 10-Jan-2019 Evening]

    A) 4f                                

    B) 6s    

    C) 6p        

    D)                  5d

    Correct Answer: D

    Solution :

    Electronic configuration of element having atomic number 71 is [Xe] \[4{{f}^{14}}6{{s}^{2}}5{{d}^{1}}\].


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