1.

Define crystal field stabillisation energy .(CFSE).

Answer»

Solution :It is DEFINED as the energy difference of electronic CONFIGURATIONS in the ligand field `(E_(LF))` and the isotopic field/ barycentre `(E_(iso))`
CFSE `(DeltaE_(O))={E_(LF)}-{E_(iso)}`
`={[n_(T2G)-(0.4)+n_(eg)(0.6)]Delta_(O)+n_(P)P]-n_(P)^(1)P`
Where,
`n_(t2g)=` the number of electrons in `t_(2g)` orbital.
`n_(eg)=` the number of electrons in `n_(g)` orbital.
`n_(P)=` number of electron pairs in the ligand field.
`N._(P)`= number of elctron pairs in the iso tropic field


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