Question
Indicate the number of unpaired electrons in: Fe.

Answer

Iron (Fe):
Atomic number = 26
The electronic configuration is:
$1 s^2\ 2 s^2\ 2 p^6\ 3 s^2\ 3 p^6\ 4 s^2\ 3 d^6$
The orbital picture of chromium is:

From the orbital picture, iron has four unpaired electrons.

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