These all end with -ate or -ite, and the real reasoning deals with the oxidation state of the nonmetal, sort of its hypothetical charge within the covalently bonded polyatomic ion. Video\(\PageIndex{2}\): 3:10 min YouTube on nomenclature for binary ionic compounds (with type I metal cations). The value lies between 0.4 and 2.00, implying that the bond type is polar covalent. CO = carbon monoxide BCl3 = borontrichloride, CO2 = carbon dioxide N2O5 =dinitrogen pentoxide. This does not mean there are two atoms, but two types of atoms, so Al2S3 is a binary ionic compound. [CDATA[*/{"annotations":null,"assetRoot":null,"branding":null,"clientUrl":"https://cdn.hypothes.is/hypothesis/1.38.0/build/boot.js","oauthEnabled":null,"onLayoutChange":null,"openLoginForm":null,"openSidebar":null,"query":null,"services":null,"showHighlights":"always","sidebarAppUrl":"https://hypothes.is/app.html","subFrameIdentifier":"042088413939617153","pluginClasses":{}}/*]]>*/, /**/, /**/.