Species having 4 bp and 0 lp or 3 bp and 1 Ip or 2 bp and 2Ip are generally sp3 hybridised. NH4+⇒4bp+0lp=sp3 hybridised BF3⇒3bp+olp⇒sp2 hybridised SF6⇒6bp+Olp=sp2d2 hybridised PCl5⇒5bp+0Ip=sp3d hybridised XeF4⇒4bp+2Ip=sp3d2 hybridised Thus, NH4+ is the species, central atom of which is sp3 hybridised.