In this MO diagram, why are the atomic Mn $3d$ orbitals higher in energy than the Ni $3d$ orbitals?

![Ni-Mn banding and antibonding states

  • 4
    $\begingroup$ Those elements are in the same period, but nickel has a higher atomic number and therefore greater effective nuclear charge. $\endgroup$
    – Zhe
    Jun 28 '17 at 15:20
  • 2
    $\begingroup$ Higher effective nuclear charge means increased stabilization of electrons. $\endgroup$
    – Zhe
    Jun 28 '17 at 17:27

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