According to crystal field theory,how many unpaired electrons are present in the complex ion [Fe(H₂O)₆]²⁺? The water molecules are weak field ligands. A)1 B)2 C)3 D)4 E)5

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According to crystal field theory, weak field ligands do not cause significant splitting of d orbitals. Hence, we can assume that the complex is high spin (all five electrons occupy the d orbitals with the same spin), and the configuration would be (t2g)5(eg)0. Thus, all five electrons are unpaired, and the answer is D.

According to Crystal Field Theory,how Many Unpaired Electrons Are Present