Among the triatomic molecules/ions BeCl2,N3−,N2O,NO2+,O3,SCl2,ICl2−,I3− and XeF2, the total number of linear molecule(s)/ ions(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].