Among the triatomic molecules/ions, BeCl2, N3⊝,N2O,NO2⊕,O3,SCl2,ICI2⊝,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 ]