Distinguish between the possibillities in complex ions of `Delta =0` and `CFSE =0` Give an example of each .

Explanation

`Delta =0` means no crystal field spliting i.e case of free gaseous ion `CFSE =0` means equal occupancy of all the d-orbitals `d^(5)` weak field and `d^(10)` both weak and strong field ion Example of case when `Delta_(0) = 0, Zn^(2+)` gaseous ion `CFSE = 0 in [Mn(H_(2)O)_(6)]^(2+)` and `[Zn(H_(2)O)_(6)]^(2+)`
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