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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 sameAdd the suffix “ide” to the name of the non-
metal.Name = Metal + Non-Metal + ideExample:
MgS = Magnesium SulfideLi2O = Lithium OxideCa3As2 = Calcium Arsenide
Standard Practice
Formula Name
LiH Lithium Hydride
MgCl2 Magnesium Chloride
CaSe Calcium Selenide
Be3N2
NaI
Standard Practice
Formula Name
LiH Lithium Hydride
MgCl2 Magnesium Chloride
CaSe Calcium Selenide
Be3N2Beryllium Nitride
NaI
Standard Practice
Formula Name
LiH Lithium Hydride
MgCl2 Magnesium Chloride
CaSe Calcium Selenide
Be3N2Beryllium Nitride
NaI Sodium Iodide
Transition Metals and Nomenclature
Transition metals are the elements in the “bridge” of the periodic table (groups 3-12)
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 non-
metal. Name = Transition Metal + (Roman Numeral)
+ Non-Metal + ide Ex. [Au]3+ and [Cl]-
= AuCl3
= Gold (III) Chloride
Use the Criss-Cross 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: AuNWe 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
FeF2Iron (II) Flouride
FeN Iron (III) Nitride
TiP Titanium (III) Phosphide
TiCl4
PdS
Transition Metal Practice
FeF2Iron (II) Flouride
FeN Iron (III) Nitride
TiP Titanium (III) Phosphide
TiCl4 Titanium (IV) Chloride
PdS
Transition Metal Practice
FeF2Iron (II) Flouride
FeN Iron (III) Nitride
TiP Titanium (III) Phosphide
TiCl4 Titanium (IV) Chloride
PdSPalladium (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
BeCrO4Beryllium Chromate
LiCN Lithium Cyanide
Ca(HSO3)2Calcium Bicarbonate
(NH4)2S
Co(NO3)3
Polyatomic Practice
BeCrO4Beryllium Chromate
LiCN Lithium Cyanide
Ca(HSO3)2Calcium Bicarbonate
(NH4)2S Ammonium Sulfide
Co(NO3)3