[Fe(CN) 6 ] 4- has how many unpaired electrons? A)2 B)0 C)4 D)3 E)1

The Fe(II) ion has six d electrons, which pair up in the presence of strong ligands such as CN-. Since S2- is a weak ligand, it does not cause pairing of d electrons. Therefore, there are no unpaired electrons in Fe(II) and the entire complex has 0 unpaired electrons.

[Fe(CN) 6 ] 4- has how many unpaired electrons? A)2 B)0 C)4 D)3 E)1

The Fe(II) ion has six d electrons, which pair up in the presence of strong ligands such as CN-. Since S2- is a weak ligand, it does not cause pairing of d electrons. Therefore, there are no unpaired electrons in Fe(II) and the entire complex has 0 unpaired electrons.