Work Step by Step
Cr: $[Ar]\ 3d^5\ 4s^1$, 6 unpaired Fe: $[Ar]\ 3d^6\ 4s^2$, 4 unpaired Mn: $[Ar]\ 3d^5\ 4s^2$, 5 unpaired Ni: $[Ar]\ 3d^8\ 4s^2$, 2 unpaired
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