Naming Ionic Compounds
Lisa
Paul
Mary
Tom
Joe
Jane
Mark
Jenny
* Recall that ionic compounds are always between a
_________(metal) and an _________(nonmetal).
RULES FOR NAMING IONIC COMPOUNDS
1. Determine the ions.
2. The cation is ALWAYS named first.
It is given it’s ELEMENT NAME.
3. The anion is named by:
- Taking the first part of the element name &
adding the suffix “-ide”.
(If you look up the ions on your Ion Sheet, the work is done for you!)
Examples: (Reverse crisscross to determine the oxidation number)
Chemical Formula
Ions
Name of Compound
NaCl
Na+, ClKI
CaS
CsBr
MgO
AlCl3
BeS
K2S
NiCl2
Zn3P2
What if there is more than one oxidation
number for an ion? How do you know which one
is used in the chemical formula?
Example:
Iron (Fe) can form two ions: Fe2+ or Fe3+
Use the reverse crisscross to
determine which oxidation
number works in the compound.
Ions
FeCl2  _________
To indicate which cation is used, we use a
ROMAN NUMERAL after the cation name.
Compound Name
FeCl2  Iron (II) Chloride
Warning: Be aware that sometimes the formula has been
reduced. You need to know both oxidation numbers before you
can be sure which cation is correct!
Example:
Ions
PbO2  _________
Compound Name
______________
More practice…hip, hip
Chemical Formula
Ions
(Cation/ Anion )
Compound Name
CuCl
Fe2O3
PbO2
CrCl3
Naming Ionic Compounds with Polyatomic Ions
1. Determine the ions
2. Name the cation first(element name).
3.
Name the polyatomic ion. (Use your Ion sheet!)
Chemical Formula
Li2CO3
Na2SO4
CaCO3
NH4Cl
Mn(OH)2
Mg(NO2)2
BaSiO3
Zn3(PO4)2
RaC2O4
NaOH
Ions
Li+, CO32-
Name of Compound
Lithium Carbonate