In iron atom ( $z = 26$ ), the differentiating electron enters sublevel:

4 d

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3 d

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4 p

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5 p

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Solution

The correct option is B $3 d$
Iron - $F e$ - $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{2} 3 d^{6}$ , so the differentiating electron entering in to the $3 d$ subshell (orbital).

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(n - 1) d

1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{2} 3 d^{10} 4 p^{6} 5 s^{2} 4 d^{10} 5 p^{6}

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