1.

What is crystal field stabilization energy (CFSE) ?

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Solution :The crystal field stabilisation energy is DEFINED as the energy difference of electronic configuration in the ligand field `(E_(LF))` and the isotropic field (Eiso).
`CFSE(DeltaE_(0))={E_(LF)}-{E_(iso)}`
`={[n_(t_(2g))(-0.4)+n_(e_(g))(0.6)Delta_(0)+n_(p)P}-{n._(p)P}`
Here `n_(t_(g))` is the number of electrons in `t_(2g)` orbitals
`n_(e_(g))` is the number of electrons in `e_(g)` orbitals
`n_(p)` is the number of electrons in the ligand field
`n._(p)` is the number of electrons in the isotropic field


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