Among the triatomic molecules/ions `BeCl_(2),N_(3)^(-),N_(2)O, NO_(2)^(+), O_(3), SCl_(2), lCl_(2)^(-),l_(3)^(-)` and `XeF_(2)`, the total number of linear molecules (s)/ion(s) where the hybridisation of the central atom does not have contribution from the `d`- orbitals (s) is [atomic number of `S=16, Cl=17, I=53` and `Xe=54`]