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 .