NAMING IONIC COMPOUNDS: METAL CHARGES Some metals have more than one common ion: iron: Fe 2+ or Fe 3+ iron: Fe 2+ or Fe 3+ copper: Cu 1+ or Cu 2+ copper: Cu 1+ or Cu 2+ tin: Sn 2+ or Sn 4+ tin: Sn 2+ or Sn 4+ Use STOCK system or CLASSICAL system to name these compounds.

NAMING IONIC COMPOUNDS: STOCK SYSTEM Roman numeral = charge of the ion Fe 2+ is named iron (II) Fe 2+ is named iron (II) Fe 3+ is named iron (III) Fe 3+ is named iron (III) Cu 1+ = copper (I) Cu 1+ = copper (I) Cu 2+ = copper (II) Cu 2+ = copper (II)

NAMING IONIC COMPOUNDS: STOCK SYSTEM examples: FeCl 2 iron (II) chloride PbF 4 lead (IV) fluoride Cu 2 Ocopper (I) oxide SnS 2 tin (IV) sulfide

NAMING IONIC COMPOUNDS: CLASSICAL SYSTEM root word for element + new suffix –ous = lower charged ion –ous = lower charged ion –ic = higher charged ion –ic = higher charged ion Fe 2+ = ferrous ion, Fe 3+ = ferric ion Fe 2+ = ferrous ion, Fe 3+ = ferric ion Cu 1+ = cuprous ion, Cu 2+ = cupric ion Cu 1+ = cuprous ion, Cu 2+ = cupric ion

NAMING IONIC COMPOUNDS: CLASSICAL SYSTEM examples: FeCl 2 ferrous chloride PbF 4 plumbic fluoride Cu 2 Ocuprous oxide SnS 2 stannic sulfide

WRITING FORMULAS examples: chromic bromideCrBr 3 mercury (II) nitrideHg 3 N 2 cobaltous oxideCoO iron (III) iodideFeI 3

FormulaStock Name Classical Name Cu 1+ Cu 2+ Fe 2+ Fe 3+ Hg 2 2+ Hg 2+ Pb 2+ Pb 4+ Sn 2+ Sn 4+ Cr 2+ Cr 3+ Mn 2+ Mn 3+ Co 2+ Co 3+ copper (I) ion copper (II) ion iron (II) ion iron (III) ion mercury (I) ion mercury (II) ion lead (II) ion lead (IV) ion tin (II) ion tin (IV) ion chromium (II) ion chromium (III) ion manganese (II) ion manganese (III) ion cobalt (II) ion cobalt (III) ion cuprous ion cupric ion ferrous ion ferric ion mercurous ion mercuric ion plumbous ion plumbic ion stannous ion stannic ion chromous ion chromic ion manganous ion manganic ion cobaltous ion cobaltic ion