Nomenclature

5.1 Naming CompoundsBinary compounds: 2 elements are joined by

a bondIonic compound

Metal + nonmetalCovalent compound

Nonmetal + nonmetal

5.2 Naming Binary CompoundsType I

Metals present forms only type of cation E.g +1 charge

Type IIMetals can form two or more cations that have

different chargesE.g +2, +3 etc… charges

Rules for Naming Type IThe cation is always named first and the anion

secondThe name of cation stays the same

Na+ = SodiumThe name of anion takes the first part of the root

name and adding –ideCl- = Cloride

Steps in naming a compoundCsFStep 1

Identify the cations and anion (as well as the group number

Step 2Name the cation

Step 3Name the anion

Step 4Name the compound by combining the names

ExampleName each binary compound

AlCl3

ZnSBaH2

MgO

Naming Binary Ionic CompoundType IIContains metals mostly from the transitional

groupMust use Roman numeral to indicate their

chargesE.g +2 = II

+3 = III+4 = IV

ExampleGive the system of each of the following

compoundsPbCl4

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 usedThe 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.

ExampleName the following compound

CCl4

SiO2

P4O6

NO

5.5 Naming Compounds that Contain Polyatomic IonsPolyatomic ions – two or more nonmetals are

covalently bonded and have chargesCan be positively charge or negatively charge

Oxyanion – nonmetal is bonded to an oxygen element and carried a negative charge

ExampleName the following compounds

Na2CO3

CsClO3

Fe(OH)2

Ca(HCO3)2

Naming AcidsAcids – substance that produces H+ when

dissolve in waterPrefix 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

ExampleName the following acids

HClHFHBrO4

H2SO4

HCN