In the following pairs of binary compounds, determine which one is a molecular substance and which one is an ionic substance. Use the appropriate naming convention (for ionic or molecular substances) to assign a name to each compound: (a) \(\mathrm{SiF}_{4}\) and \(\mathrm{LaF}_{3},(\mathbf{b}) \mathrm{FeCl}_{2}\) and \(\mathrm{ReCl}_{6},(\mathrm{c}) \mathrm{PbCl}_{4}\) and \(\mathrm{RbCl} .\)

(a) \(\mathrm{SiF}_{4}\): non-metal + non-metal, therefore molecular \(\mathrm{LaF}_{3}\): metal + non-metal, therefore ionic (b) \(\mathrm{FeCl}_{2}\): metal + non-metal, therefore ionic \(\mathrm{ReCl}_{6}\): metal + non-metal, therefore ionic (c) \(\mathrm{PbCl}_{4}\): metal + non-metal, therefore ionic \(\mathrm{RbCl}\): metal + non-metal, therefore ionic

(a) \(\mathrm{SiF}_{4}\): molecular, so we use prefixes Name: silicon tetrafluoride \(\mathrm{LaF}_{3}\): ionic, so we use the -ide suffix for the non-metal Name: lanthanum fluoride (b) \(\mathrm{FeCl}_{2}\): ionic, so we use the -ide suffix for the non-metal Name: iron(II) chloride (Roman numeral indicates the charge on the metal) \(\mathrm{ReCl}_{6}\): ionic, so we use the -ide suffix for the non-metal Name: rhenium(VI) chloride (Roman numeral indicates the charge on the metal) (c) \(\mathrm{PbCl}_{4}\): ionic, so we use the -ide suffix for the non-metal Name: lead(IV) chloride (Roman numeral indicates the charge on the metal) \(\mathrm{RbCl}\): ionic, so we use the -ide suffix for the non-metal Name: rubidium chloride Summary: (a) \(\mathrm{SiF}_{4}\): molecular substance, silicon tetrafluoride \(\mathrm{LaF}_{3}\): ionic substance, lanthanum fluoride (b) \(\mathrm{FeCl}_{2}\): ionic substance, iron(II) chloride \(\mathrm{ReCl}_{6}\): ionic substance, rhenium(VI) chloride (c) \(\mathrm{PbCl}_{4}\): ionic substance, lead(IV) chloride \(\mathrm{RbCl}\): ionic substance, rubidium chloride