The number of unpaired electrons in d orbital of the $F e^{+}$ ion is.

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Solution

The correct option is B 4
$F e - - - 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{64} 4 s^{2} 3 d^{6} F e + - - 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{1} 3 d^{6}$

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