Two unpaired electrons.
Explanation[Ni(H2O)2(NH3)4]2+ the Ni in this complex is in +2 oxidation state, and there are 8 electrons in 3d subshell, and since the NH3 is a strong field ligand, therefore, the two unpaired electrons left get paired up, and hence the number of unpaired electrons becomes 0. Hence, the magnetic moment n(n+2), where n is the number of unpaired electrons, comes out to be 0.
- Coordination compounds are molecules that pose one or multiple metal centres bound to ligands (atoms, ions, or molecules that donate electrons to the metal).
- A complex ion has a metal ion at its centre with several other molecules or ions surrounding it.
- The molecules or ions surrounding the central metal ion are called ligands.