Nomenclature
5.1 Naming Compounds
 Binary compounds: 2 elements are joined by a bond
 Ionic compound

Metal + nonmetal
 Covalent compound

Nonmetal + nonmetal
5.2 Naming Binary Compounds
 Type I
 Metals present forms only type of cation
 E.g +1 charge
 Type II
 Metals can form two or more cations that have different
charges
 E.g +2, +3 etc… charges
Rules for Naming Type I
 The cation is always named first and the anion second
 The name of cation stays the same
 Na+ = Sodium
 The name of anion takes the first part of the root name and
adding –ide
 Cl- = Cloride
Steps in naming a compound
 CsF
 Step 1
 Identify the cations and anion (as well as the group number
 Step 2
 Name the cation
 Step 3
 Name the anion
 Step 4
 Name the compound by combining the names
Common Type I Ions
Example
 Name each binary compound
 AlCl3
 ZnS
 BaH2
 MgO
Naming Binary Ionic Compound
Type II
 Contains metals mostly from the transitional group
 Must use Roman numeral to indicate their charges
E.g +2 = II
+3 = III
+4 = IV
Common Type II Ions
Example
 Give the system of each of the following compounds
 PbCl4
 CoCl3
 Fe2O3
 CrI3
5.3 Naming Binary Contain Only Nonmetals
(Type III)
 The first element in the formula is named first and the full
element name is used
 The second element is named as though it were an anion ( ide ending)
 Prefixes is used to indicate the number of atoms present.
(prefer to table 5.3)
 The prefix mono- is never used for naming the first element.
Example
 Name the following compound
 CCl4
 SiO2
 P4O6
 NO
Naming Binary Compounds: a Review
5.5 Naming Compounds that Contain
Polyatomic Ions
 Polyatomic ions – two or more nonmetals are covalently
bonded and have charges
 Can be positively charge or negatively charge
 Oxyanion – nonmetal is bonded to an oxygen element and
carried a negative charge
Common Polyatomic Ions
Example
 Name the following compounds
 Na2CO3
 CsClO3
 Fe(OH)2
 Ca(HCO3)2
Naming Acids
 Acids – substance that produces H+ when dissolve in water
 Prefix hydro is used when the anion does not contain
oxygen and the suffix –ic is attached to the root name of
element
 When the anion contains oxygen, the acid name is formed
from the root name of the central element of the anion or
the anion name, with a suffix of –ic or -ous
Flow Chart
Example
 Name the following acids
 HCl
 HF
 HBrO4
 H2SO4
 HCN