What factor determines whether the crystal field in an octahedral complex is to be regarded as strong or weak? How many d-electrons must be present in orbitals of the central atom atom for there to be an abrupt change in crystal field stabilisation energy strong and weak fields gt

Explanation

Crystal field in an octahedral complex to be regarded as strong or weak depends on the relative magnitude of `Delta_(0)` and `P`
(a) `If Delta_(0) gtP` Strong field
(b) If `Delta_(0) ltP,` weak field
Abrupt changes in crystal field stabisation energy between strong and weak fields occur with `d^(4),d^(5),d^(6)` and `d^(7)` configurations .