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Which of the following is correct set of quantum numbers for the last electron entering in "Fe"?
$n l m$ $s$

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4 0 0 + \frac{1}{2}

\begin{array}{llll} 3 1 0 - \frac{1}{2} \end{array}

\begin{array}{llll} 3 2 - 1 + \frac{1}{2} \end{array}

\begin{array}{llll} 3 2 - 3 - \frac{1}{2} \end{array}

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detailed solution

Correct option is C

The electronic configuration of iron is,

$1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{2} 3 d^{6}$

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