Ionic Compounds: Naming

First Step in NamingFirst Step in Naming

• Find metal

• If metal has only one oxidation state it’s easy

• If metal has more than one oxidation state, there’s an extra step

Naming Binary Ionic Compounds

1. Always name metal (+ ion) first

2. Write stemstem nonmetal (- ion)

3. Add ending “ide” to nonmetal

• Hydrogen = hydr• Nitrogen = nitr• Oxygen = ox• Fluorine = fluor• Chlorine = chlor• Bromide = brom• Iodide = iod• Phosphorus = phosph• Sulfur = sulf• Tellurium = tellur• Sellenium = selen• Arsenic = arsen

Metals with one oxidation state

• CaO• BaS• AlN• LiCl• Al2Se3

• Na2O• K3N• MgF2

Calcium OxCalcium Oxideide

Barium SulfBarium Sulfideide

Aluminum NitrAluminum Nitrideide

Lithium ChlorLithium Chlorideide

Aluminum SelenAluminum Selenideide

Sodium OxSodium OxideidePotassium NitrPotassium Nitrideide

Magnesium FluorMagnesium Fluorideide

Metals with > 1 oxidation state

• Use formula to figure out oxidation Use formula to figure out oxidation state metal state metal

• Ex: Fe can be Fe+2 oror Fe+3

• Name FeO and Fe2O3

– 2 different2 different compounds – cannot name both iron oxide – every formula has 1 name only

FeO and Fe2O3

• Compounds are electrically neutral

• Oxygen is -2

FeOFeO

Name: Name: Iron (II) oxideIron (II) oxide(II = 2 for (II = 2 for ++2 charge on Fe)2 charge on Fe)

1 O (-2)1 O (-2)

so Fe must be +2so Fe must be +2

FeO and Fe2O3

FeFe22OO33

O is -2O is -2

3 O’s 3 O’s [3 x (-2) = -6][3 x (-2) = -6]total negative chargetotal negative charge

Total positive Total positive charge must be +6charge must be +6

So each Fe is +3So each Fe is +3Iron (III) oxideIron (III) oxide

• TiCl3

• Mn2O4

• Co2O3

• PdBr2

• AuCl3

• MoN

• MnO

• TiO

Titanium (III) chlorideTitanium (III) chloride

Manganese (IV) oxideManganese (IV) oxide

Cobalt (III) oxideCobalt (III) oxide

Palladium (II) bromidePalladium (II) bromide

Gold (III) chlorideGold (III) chloride

Molybdenum (III) nitrideMolybdenum (III) nitride

Manganese (II) oxideManganese (II) oxide

Titanium (II) oxideTitanium (II) oxide

Summary for Binary Ionic Summary for Binary Ionic CompoundsCompounds

• Formula: positive first, always

• metal > 1 oxidation state, name needs roman numeral

• Name = metal + stem nonmetal + ide