In case of trivalent N, the molecules are pyraMIDAL in nature.one of the orbitals is occupied by the lone pair of electrons.now, due to vibration in the molecule along the axis perpendicular to the bond axis ,the molecules are inverted and the two forms remain in equilibrium state .these two forms are non superimposablemirror images(showing enantiomerism) --- this phenomenon of trivalent n compounds are known as INVERTOMERISM
Invertomerism typically refers to the ability of certain molecules to exist in two forms that are mirror images of each other, known as enantiomers. These enantiomers have the same chemical structure but differ in their spatial arrangement, leading to different chemical and biological properties. In biological systems, enantiomers can have different effects due to interactions with specific molecular targets.