Hey!
The stability of the complex depends on the size of the metal ion. The smaller the size of the metal ion, the more stable with the metal complexes.
The stability order of the complexes mentioned in the question is: mn2+< fe2+< Co2+< Ni2+
Hope this answer helps!
Question : Which theory discusses the relationship between ligand bonding and degradation of d orbitals in metal complexes and the geometry of metal complexes and the splitting of d orbitals?
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