However , hybridisation of s , p and d orbitals together is no longer accepted , as more recent calculations based on molecular orbital theory have shown that in main-group molecules the d component is insignificant , while in transition metal complexes the p component is insignificant ( see below ) .
However , such a scheme is now superseded as more recent calculations based on molecular orbital theory have shown that in main-group molecules the d component is insignificant , while in transition metal complexes the p component is insignificant ( see below ) .