An octahedral complex of a 3d transition metal ion is found to be diamagnetic. Ignoring pairing energy, the possible magnitudes of its crystal field stabilization energy (CFSE) in terms of _o are:

Step-by-step solution

A diamagnetic complex must have zero unpaired electrons. In an octahedral crystal field, the d -orbitals split into a lower energy t_ 2g set and a higher energy e_g set. The only possible d -electron configurations that result in zero unpaired electrons in an octahedral field are: 1. d^0 : Configuration is t_ 2g ^0 e_g^0 . CFSE = 0 2. d^6 (strong field / low spin): Configuration is t_ 2g ^6 e_g^0 . CFSE = [6 (-0.4) + 0 (0.6)] _o = -2.4 _o . The magnitude is 2.4 _o . 3. d¹⁰ : Configuration is t_ 2g ^6 e_g^4 . CFSE =