Nomenclature
Ionic Compounds
Topics
Ionic
Nomenclature
Standard
Transition
Metals
(multivalent)
Polyatomic
Ions
Nomenclature

Latin: Nomen – name, Clature – to call

A standardized naming system. In this
case, we are applying it to compounds.

Ex.

NaCl = Sodium Chloride
Standard Ionic Nomenclature

All ionic bonds are formed between metals
and non-metals.
 Standard Ionic Bonds are formed between:



Cations from group 1, 2, or 3
and
Anions from group 15, 16, or 17
Example:


NaCl
Ca3P2
Standard continued…

Rules:
The metal’s name remains the same
 Add the suffix “ide” to the name of the nonmetal.

Name = Metal + Non-Metal + ide
 Example:

MgS = Magnesium Sulfide
 Li2O = Lithium Oxide
 Ca3As2 = Calcium Arsenide

Standard Practice
Formula
LiH
MgCl2
CaSe
Be3N2
NaI
Name
Standard Practice
Formula
Name
LiH
MgCl2
CaSe
Be3N2
NaI
Lithium Hydride
Standard Practice
Formula
Name
LiH
MgCl2
CaSe
Be3N2
NaI
Lithium Hydride
Magnesium Chloride
Standard Practice
Formula
Name
LiH
MgCl2
CaSe
Be3N2
NaI
Lithium Hydride
Magnesium Chloride
Calcium Selenide
Standard Practice
Formula
Name
LiH
MgCl2
CaSe
Be3N2
NaI
Lithium Hydride
Magnesium Chloride
Calcium Selenide
Beryllium Nitride
Standard Practice
Formula
Name
LiH
MgCl2
CaSe
Be3N2
NaI
Lithium Hydride
Magnesium Chloride
Calcium Selenide
Beryllium Nitride
Sodium Iodide
Transition Metals and Nomenclature
Transition metals are the elements in the
“bridge” of the periodic table (groups 312)
 SOME of the transition metals can form
more than one type of ion. Therefore, we
must find some way to indicate the
charge of the ion in the name.
 We use Roman Numerals

Roman Numerals
One - I
Six - VI
Two - II
Seven - VII
Three - III
Eight - VIII
Four - IV
Nine - IX
Five - V
Ten - X
Transition Metals Continued…

Rules



The name of the transition metals remains the
same
The charge of the transition metal is indicated with
roman numeral in brackets
The suffix “ide” is added to the name of the nonmetal.

Name = Transition Metal + (Roman Numeral)
+ Non-Metal + ide
Use the Criss-Cross
 Ex. [Au]3+ and [Cl]= AuCl3
= Gold (III) Chloride
Rule to discover the
charge from the
chemical equation.
Criss-Cross Rule and Finding
Charges
Some chemical formulas do not directly
indicate the charge of the transition
metal. We need to work backwards to
figure it out.
 Ex: AuN

We know that Nitrogen forms an ion with a
charge of 3 Therefore, Gold must have a charge of 3+
 The name is then Gold (III) Nitride

Transition Metal Practice
FeF2
FeN
TiP
TiCl4
PdS
Transition Metal Practice
FeF2
FeN
TiP
TiCl4
PdS
Iron (II) Flouride
Transition Metal Practice
FeF2
Iron (II) Flouride
FeN
Iron (III) Nitride
TiP
TiCl4
PdS
Transition Metal Practice
FeF2
Iron (II) Flouride
FeN
Iron (III) Nitride
TiP
Titanium (III) Phosphide
TiCl4
PdS
Transition Metal Practice
FeF2
Iron (II) Flouride
FeN
Iron (III) Nitride
TiP
Titanium (III) Phosphide
TiCl4
Titanium (IV) Chloride
PdS
Transition Metal Practice
FeF2
Iron (II) Flouride
FeN
Iron (III) Nitride
TiP
Titanium (III) Phosphide
TiCl4
Titanium (IV) Chloride
PdS
Palladium (II) Sulfide
Polyatomic Ions and Ionic
Nomenclature



Polyatomic Ions are ions that are composed of more
than one type of atom. Most are negative ions /
metals.
Ex. NH4+
Rules:
 The name of the metal stays the same.
 The names of the polyatomic ions are provided on
the polyatomic ions chart. Their names do not
change.
 If the polyatomic ion is first in the compound
(positive / metal), you must add the suffix “ide” to
the non-metal).
Name = Metal + Polyatomic Ion
or

Name = Polyatomic Ion + Non-Metal +ide
Polyatomic Practice
BeCrO4
LiCN
Ca(HSO3)2
(NH4)2S
Co(NO3)3
Polyatomic Practice
BeCrO4
LiCN
Ca(HSO3)2
(NH4)2S
Co(NO3)3
Beryllium Chromate
Polyatomic Practice
BeCrO4
LiCN
Ca(HSO3)2
(NH4)2S
Co(NO3)3
Beryllium Chromate
Lithium Cyanide
Polyatomic Practice
BeCrO4
LiCN
Ca(HSO3)2
(NH4)2S
Co(NO3)3
Beryllium Chromate
Lithium Cyanide
Calcium Bicarbonate
Polyatomic Practice
BeCrO4
LiCN
Ca(HSO3)2
(NH4)2S
Co(NO3)3
Beryllium Chromate
Lithium Cyanide
Calcium Bicarbonate
Ammonium Sulfide
Polyatomic Practice
BeCrO4
LiCN
Ca(HSO3)2
Beryllium Chromate
Lithium Cyanide
Calcium Bicarbonate
(NH4)2S
Ammonium Sulfide
Co(NO3)3
Cobalt (III) Nitrate