Among the triatomic molecules/ions,BeCl2,N3−,N2O,NO2+,O3,SCl2,ICl2−,I3−and XeF2 the total number of linear molecule(s)/ion(s) where the hybridization of the central atom does not have contribution from the d-orbital(s) is : [Atomic number :S=16,Cl=17,I=53 and Xe=54 ]

BeCl2,N3−,N2O,NO2+,O3,SCl2,ICl2−,I3−,XeF2BeCl2⟶sp⟶ linear;                  N3−⟶sp⟶ linear N2O⟶sp⟶ linear;                     NO2⟶sp⟶ linear O3⟶sp2⟶ bent;                        SCl2⟶sp3⟶ bent I3−⟶sp3d⟶ linear;                     ICl2−⟶sp3d⟶ linear XeF2⟶sp3d⟶ linear     There are four (4) linear molecules/ions and no d- orbital is involved in hybridization.