Among the triatomic molecules/ions, BeCl2, N3, NO, NO2, O3, SC12, IC12, 13 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, C1 = 17, I = 53 and Xe = 54]