Question

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

Answer 1

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 .