FACTORS AFFECTING THE CFS There are various factor which affect the value of CFS. Which are as follow with their description Oxidation state of the metals  Crystal field splitting increases on increasing in oxidation state of the metal. This is because the ligands with their electron density can approach the higher-charge (smaller sized) metal-ion more closely and interact more strongly with the d orbitals. Thus the complex [Co(NH 3 ) 6 ] + 3   in which Co in 3+ oxidation state has large crystal field splitting and [Co(NH 3 ) 6 ] 2 + with Co in 2+ oxidation state possesses small crystal field splitting . Principal Quantum no./ Size of the d orbital Crystal field splitting increases with increase in the principal quantum no. of the d- orbital. As the Principal Quantum number increases the distance of the d-orbital of the metal from its nucleus increases. Such an orbital interacts more strongly with the ligands giving large splitting. In genral, crystal fiel...