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

1. A

2. B

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

3. C

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

4. D

$\begin{array}{l}3 2 -3 -\frac{1}{2}\end{array}$

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Solution:

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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