The possible set of quantum numbers (n,l,m,s) of the last electron of unipositive potassium ion :

  1. A

    3,2,0,12

  2. B

    4,0,0,12

  3. C

    4,1,0,12

  4. D

    None of these

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    Solution:

    From the given options their is no possible set of quantum numbers (n,l,m,s) of the last electron of unipositive potassium ion.

    The electronic configuration of potassium ion is,

     19K+=1s22s22p63s23p6

      It is observed that the last e goes into 3p subshell

    The value of the quantum number are, n=3;l=1;m=1,0,1;s=+12,12.

    Hence, the option D is correct.

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