Which of the following is correct set of quantum numbers for the last electron entering in "Fe"?

n     l      m        s

  1. A

     4 0 0 +12

  2. B

    3    1    0    12

  3. C

    3    2    1    +12

  4. D

    3    2    3    12

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    Solution:

    The electronic configuration of iron is,

    1s22s22p63s23p64s23d6

    Here the value of shell n is 3 for which the value of subshell l is (n-1) which is 2.
    the value of m ranges from -2 to 2 for which s will be -1/2 if we select -2. Thus, option C is correct.

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