Hybridisation (H)=[ No. of valence electrons of central atom + No. of monovalent atoms attached to it +(−ve charge if any −(+ ve charge if any )] NO2+= i.e. sp hybridisation NO2−= i.e. sp2 hybridisation NO3−= i.c. sp2 hybridisation The Lewis structure of NO2 shows a bent molecular geometry with trigonal planar electron pair geometry hence the hybridization will be sp2.