text: your names would be:\nSF6 --> Sulfur hexaoxide \nN2O5--> Dinitrogen pentaoxide\nNF3 ---> Nitrogen trifluoride\nP2S3 ---> Diphosphorus Trisulfide\n\nAll of these are covalently bonded (nonmetal+nonmetal, non-ionic compounds) and are binary (made of two elements), hence, you would use the numerical prefixes for both elements, (mono-, di-, tri, tetra-, etc.)  and the -ide suffix for the ending element. NOTE: you ususally don't use the mono- prefix in the first element of the compound if there is only one the compound. For example, you wouldn't say monosulfur hexaoxide (SF6) nor would you say monocarbon monoxide (CO).