Among the triatomic molecules/ions BeCl2, N3-, N2O, NO2+, O3, SCl2, ICl2-, I3- and XeF2, the total number of linear molecule(s)/ion(s) are [atomic number of S=16, Cl=17, I=53 and Xe=54]
(7)
Except for O3, SCl2, rest all are linear molecules.