Ionic Compounds: Naming

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Ionic Compounds Naming
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Naming Binary Ionic Compounds

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

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

• find metal on PT
• if metal has only one oxidation state its easy
• if metal has more than one oxidation state,
  theres an extra step

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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
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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

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metals with more than 1 oxidation state

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

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FeO and Fe2O3

• 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)
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FeO and Fe2O3

• compounds are electrically neutral
• oxygen is -2

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

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

manganese (IV) oxide
cobalt (III) oxide
palladium (II) bromide
gold (III) chloride
molybdenum (III) nitride
manganese (II) oxide
titanium (II) oxide
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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 (dont modify ending)

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name the following
sodium hydroxide

• NaOH
• KHCO3
• LiNO3
• CaSO4
• Al(NO3)3
• Fe(OH)2
• CuSO4
• CuSCN

potassium hydrogen carbonate
lithium nitrate
calcium sulfate
aluminum nitrate
iron (II) hydroxide
copper (II) sulfate
copper (I) thiocyanate
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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

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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

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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

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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