Ionic Compounds: Naming

1
Ionic Compounds Naming
2
The First Step in Naming

• find metal on PT
• ask Q - does metal have
• only one oxidation state
• its easy, just follow the three steps
• more than one oxidation state
• then theres an extra step add roman numeral to
  indicate which oxidation state of metal being used

3
Naming BINARY Ionic Compounds(using metal with
only one oxidation state)

• always name metal () cation first
• 2. write stem of non-metal (-) anion
• 3. add ending ide to non-metal

4
stems of non-metalsshorten names then add ide
element stem binary name ending
nitrogen nitr nitride
phosphorus phosph phosphide
arsenic arsen arsenide
selenium selen selenide
oxygen ox oxide
bromine brom bromide
iodine iod iodide
fluorine fluor fluoride
chlorine chlor chloride
5
metals with one oxidation state(name metal, stem
non-metal, add ide ending)

• CaO
• BaS
• AlN
• LiCl
• Al2Se3
• Na2O
• K3N
• MgF2

calcium oxide
barium sulfide
aluminum nitride
lithium chloride
aluminum selenide
sodium oxide
potassium nitride
magnesium fluoride
6
what if the metal has more than one possible
oxidation state?

• roman numeral is added to indicate the oxidation
  number of metal used
• I 1 VI 6
• II 2 VII 7
• III 3 VIII 8
• IV 4 IX 9
• V 5 X 10

7
metals with more than 1 oxidation state

• figure out which ox for metal ion
• ex Fe can be Fe2 or Fe3
• FeO and Fe2O3
• two different compounds
• every formula has 1 name only
• cannot name both iron oxide

8
FeO and Fe2O3

• charge non-metal helps figure charge metal

oxygen is -2
so Fe must be 2
1 O is -2
FeO
name iron (II) oxide (roman numeral II
represents 2 charge on Fe)
9
FeO and Fe2O3

• oxygen is -2

each O is -2
Fe2O3
3 Os 3(-2) -6 total negative charge
total positive charge must be 6
10
Name the following

• TiCl3
• Mn2O4
• Co2O3
• PdBr2
• AuCl3
• MoN
• TiO

titanium (III) chloride
manganese (IV) oxide
cobalt (III) oxide
palladium (II) bromide
gold (III) chloride
molybdenum (III) nitride
titanium (II) oxide
11
Naming Compounds with Polyatomic Ions

• polyatomic ions have names (Table E)
• naming similar to binary naming
• naming rules
• positive always written first
• if ()ve ion is a metal, check oxidation states
  has
• if more than 1, need roman numeral
• if ()ve ion is polyatomic - 2nd part of name is
  name of polyatomic (dont modify ending)

12
name the following

• Na(OH)
• K(HCO3)
• Li(NO3)
• Ca(SO4)
• Fe(OH)2
• Cu(SO4)
• Cu(SCN)

sodium hydroxide
potassium hydrogen carbonate
lithium nitrate
calcium sulfate
iron (II) hydroxide
copper (II) sulfate
copper (I) thiocyanate
13
Summary Naming Binary
Ionic Compounds

• STEPS
• name metal
• put roman in ( )
• - ONLY if metal has more than one ox
• name stem of non-metal
• add ide ending

14
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