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The electronic configuration of iron, 26Fe, is 1s22s22p63s23p63d64s2. There are 6 electrons in the outermost, partially-filled sub-shell 3d.
Note: it might be useful to draw the m sub-shells using arrows to represent the electrons occupying the orbital 3d and, as such, illustrate the possible arrangements, consistent with the Pauli exclusion principle, in terms of m and spin orientation.
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