Ionic Compounds: Naming
First 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 stem 2. Write stem 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 Al 2 Se 3 Na 2 O K 3 N MgF 2 Calcium Oxide Barium Sulfide Aluminum Nitride Lithium Chloride Aluminum Selenide Sodium Oxide Potassium Nitride Magnesium Fluoride
Metals with > 1 oxidation state Use formula to figure out oxidation state metalUse formula to figure out oxidation state metal orEx: Fe can be Fe +2 or Fe +3 Name FeO and Fe 2 O 3 – 2 different – 2 different compounds – cannot name both iron oxide – every formula has 1 name only
FeO and Fe 2 O 3 Compounds are electrically neutral Oxygen is -2 FeO Name: Iron (II) oxide (II = 2 for + 2 charge on Fe) 1 O (-2) so Fe must be +2 so Fe must be +2
FeO and Fe 2 O 3 Fe 2 O 3 O is -2 3 O’s [3 x (-2) = -6] total negative charge Total positive charge must be +6 So each Fe is +3 Iron (III) oxide
TiCl 3 Mn 2 O 4 Co 2 O 3 PdBr 2 AuCl 3 MoN MnO TiO Titanium (III) chloride Manganese (IV) oxide Cobalt (III) oxide Palladium (II) bromide Gold (III) chloride Molybdenum (III) nitride Manganese (II) oxide Titanium (II) oxide
Summary for Binary Ionic Compounds Formula: positive first, always metal > 1 oxidation state, name needs roman numeral Name = metal + stem nonmetal + ide