Which orbital is non directional?
They are non directional because they are spherical in shape and probability of finding electrons at a particular distance from the nucleus is same in all directions.
What does VSEPR theory explain? write its postulates.
The VSEPR theory explains that the approximate shape of the molecule can be predicted from the number of electron pairs in the valence shell of the central atom.
The postulates of the VSEPR theory are listed below: