Ionic Compounds: Naming

Naming Binary Ionic Compounds always name metal [(+) cation] first 2. write stem of non-metal [(-) anion] 3. add ending “ide” to non-metal

stems of nonmetals element stem nitrogen nitr phosphorus phosph arsenic arsen selenium selen oxygen ox bromine brom iodine iod flourine fluor chlorine chlor

The First Step in Naming find metal on PT if metal has only one oxidation state it’s easy if metal has more than one oxidation state, there’s an extra step

metals with one oxidation state (name metal, stem non-metal, add “ide”) CaO BaS AlN LiCl Al2Se3 Na2O K3N MgF2 calcium oxide barium sulfide aluminum nitride lithium chloride aluminum selenide sodium oxide potassium nitride magnesium fluoride

what if the metal has more than one possible oxidation state? must use roman numeral to indicate the oxidation number of the metal: I = 1 VI = 6 II = 2 VII = 7 III = 3 VIII = 8 IV = 4 IX = 9 V = 5 X = 10

metals with more than 1 oxidation state figure out which oxidation # for metal ion Ex: Fe can be Fe+2 or Fe+3 FeO and Fe2O3 two different compounds cannot name both iron oxide every formula has 1 name only

FeO and Fe2O3 FeO 1 O is -2 so Fe must be +2 name: iron (II) oxide compounds are electrically neutral charge non-metal helps decide metal charge oxygen is -2 1 O is -2 FeO so Fe must be +2 name: iron (II) oxide (roman numeral II represents +2 charge on Fe)

FeO and Fe2O3 Fe2O3 compounds are electrically neutral oxygen is -2 each Fe is +3 iron (III) oxide each O is -2 Fe2O3 3 O’s 3(-2) = -6 total negative charge total positive charge must be +6

Name the following TiCl3 Mn2O4 Co2O3 PdBr2 AuCl3 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

Naming Compounds with Polyatomic Ions polyatomic ions have names (Table E) naming similar to binary naming rules: positive always written first if (+)’ve ion is a metal, check to see how many oxidation states it has if more than 1, need roman numeral if (–)’ve ion is polyatomic - 2nd part of name is name of polyatomic (don’t modify ending)

name the following: NaOH KHCO3 LiNO3 CaSO4 Al(NO3)3 Fe(OH)2 CuSO4 CuSCN sodium hydroxide potassium hydrogen carbonate lithium nitrate calcium sulfate aluminum nitrate iron (II) hydroxide copper (II) sulfate copper (I) thiocyanate

Summary: Binary Ionic Compounds compounds are electrically neutral ionic formulas: positive metal ion goes first if metal has more than 1 oxidation state, name has roman numeral

Summary: Naming Binary Ionic Compounds STEPS: name metal put roman # in ( ) - only if metal has more than one ox # name stem of non-metal + ide ending

Summary: Ionic Compounds With Polyatomics compounds are electrically neutral ionic formulas: positive metal ion goes first if metal has more than 1 oxidation state, name has roman numeral

Summary: Naming Ionic Compounds With Polyatomics STEPS: name metal put roman # in ( ) - only if metal has more than one ox # name polyatomic ion If two polyatomic ions in formula then name both polyatomics putting (+) ion first