1. Ionic Compounds: Naming

2. Naming Binary Ionic Compounds
Always name the metal (the cation/+ ion) first
2. Write stem of nonmetal (the anion/ - ion)
3. Add the ending “ide” to the nonmetal

3. Stems of nonmetals Iod Brom Chlor Fluor Hydr is the stem for H Tellur
Selen
Arsen
Sulf
Phosph Ox
Nitr

4. The First Step in Naming
Find the metal on the PT
If the metal has only one oxidation state it’s easy
If the metal has more than one oxidation state, there’s an extra step

5. Metals with one oxidation state
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. Metals with > 1 oxidation state
Use the formula to figure out which oxidation state the metal ion has
Ex: Fe can be Fe+2 or Fe+3
Name FeO and Fe2O3
two different compounds
cannot name both iron oxide
every formula has 1 name only

7. FeO and Fe2O3 FeO 1 O which is -2 so Fe must be +2
Compounds are electrically neutral
Oxygen is -2
1 O which is -2
FeO
so Fe must be +2
Name: Iron (II) oxide
(roman numeral II = charge on Fe)

8. FeO and Fe2O3 Fe2O3 Compounds are electrically neutral Oxygen is -2
Each Fe is +3
Iron (III) oxide
Each O is -2
Fe2O3
There are 3 O’s
3 X (-2) = -6
Total negative charge
Total positive charge must be +6

9. Name the following Hint: Positive Always First
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

10. POLYATOMIC IONS SO42- CO32- PO43- OH-
group of covalently bonded atoms that have a charge
Table E: (+)’ve or (–)’ve
polyatomic ions have “names”
polyatomic ions can form ionic bonds with oppositely-charged ions
SO CO PO OH-

11. Ternary Compounds contain 3 or more elements
usually contain a polyatomic ion
if polyatomic is (+) it’s bonded to a nonmetal
if polyatomic is (–) it’s bonded to a metal
sometimes 2 polyatomics are bonded together

12. Formulas with polyatomics
What’s the formula for the compound formed from NH4+1 and Cl-1?
The charges must add up to zero, so just write the symbols, positive first!
NH4Cl

13. Try a few more: Na+ and OH- K + and HCO3-1 Mg+2 and CO3-2
NaOH
Na+ and OH-
K + and HCO3-1
Mg+2 and CO3-2
Li + and NO3-
NH4 + and CN-
Ca+2 and SO4-2
KHCO3
MgCO3
LiNO3
NH4CN
CaSO4

14. These are more challenging:
Mg3(PO4)2
Mg+2 and (PO4)-3
(NH4)+1 and S-2
Al+3 and (NO3)-1
Fe+2 and OH-1
Hg2+2 and SCN-1
Mg+2 and HCO3-
Al+3 and C2O42-
(NH4)2S
Al(NO3)3
Fe(OH)2
Hg2(SCN)2
Mg(HCO3)2
Al2(C2O4)3

15. Some of the most challenging are
Zn(NO3)2
Zinc + Nitrate ion
Magnesium + Hydroxide ion
Lithium + Carbonate ion
Ammonium ion + Bromine
Potassium + Sulfate ion
Calcium + Phosphate ion
Beryllium + Chlorate ion
Ammonium ion + Sulfate ion
Mg(OH)2
Li2CO3
NH4Br
K2SO4
Ca3(PO4)2
Be(ClO3)2
(NH4)2SO4

16. Naming compounds with polyatomics
polyatomic ions have names (Table E)
naming is parallel to binary naming
positive always written first
if (+)’ve ion is a metal, check to see how many oxidation states it has
if > 1 name must have a roman numeral
if (–)’ve is polyatomic - 2nd part of name is name of polyatomic (don’t modify ending)

17. 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

18. Summary for Binary Ionic Compounds
Compounds are electrically neutral
Formula: positive first, always
If metal has more than 1 oxidation state, name has a roman numeral
Name = metal + stem of nonmetal + ide