Ionic compounds

Ionic Compounds

Formulas and Nomenclature

Chemistry
2022-2023

Creating Formulas for Ionic
Compounds

▪ Another way to predict the chemical formula is to use the elements

charge.

▪ The charge of the other element becomes the subscript of the

other element and vice versa.

Ex: Ca F
Mg N

Multiple Choice

Valence electrons are the electrons in the outermost orbit of an atom.

• True

• False

Creating Formulas for Ionic
Compounds

▪ Another way to predict the chemical formula is to use the elements

charge.

▪ The charge of the other element becomes the subscript of the

other element and vice versa.

Ex: Ca2+ F1-

Ca1F2

CaF2

Mg2+ N3-

Mg3N2

Writing & Naming Binary Ionic
Compounds

▪ Name to Formula

– Write the symbol of the

elements
▪ Metal first

– Determine the charge for each

element
▪ If using a transition metal the

charge will be written as a
roman numeral

– Criss-cross the charges

▪ Examples:

Calcium Chloride

Iron (II) Oxide

Writing & Naming Binary Ionic
Compounds

▪ Name to Formula

– Write the symbol of the

elements
▪ Metal first

– Determine the charge for each

element
▪ If using a transition metal the

charge will be written as a
roman numeral

– Criss-cross the charges

CaCl

Calcium Chloride

Iron (II) Oxide

FeO

+2 -1

CaCl2

+2 -2

FeO

▪ Examples:

▪ Binary ionic

compounds will
contain two elements
– Positively charged

cation (the metal)

– Negatively charged

anion (the nonmetal)

▪ Formula to Name

– Name the metal

▪ If using a transition

metal write the charge
as a roman numeral

– Name the nonmetal and

change the last syllable
to -ide

NaCl

MnBr2

Writing & Naming Binary Ionic
Compounds

▪ Examples:

▪ Binary ionic

compounds will
contain two elements
– Positively charged

cation (the metal)

– Negatively charged

anion (the nonmetal)

▪ Formula to Name

– Name the metal

▪ If using a transition

metal write the charge
as a roman numeral

– Name the nonmetal and

change the last syllable
to -ide

Sodiumchlorine

NaCl

Sodium chloride

MnBr2

manganesebromine

manganese (II) bromide

Writing & Naming Binary Ionic
Compounds

▪ Examples:

Writing & Naming Binary Ionic

Compounds
Practice

▪ Strontium Chloride

▪ KI

▪ Aluminum Oxide

▪ AgCl

▪ Calcium Bromide

▪ Na2S

▪ Beryllium Iodide

▪ Potassium Fluoride

▪ Cs3N

▪ Copper (I) oxide

Writing & Naming Ternary
Ionic Compounds

Formula to Name
▪ Name the metal

▪ Name the polyatomic

ion

Name to Formula

▪ Determine the symbol of

the element and the
polyatomic ion.

▪ Cross the charges

A ternary ionic compound will contain an element bonded to a polyatomic ion, which is a
charged group of atoms acting as a single unit.

Co2(SO4)3

CalciumNitrate

Polyatomic Ions
Nitrate

NO3

-1

Nitrite

NO2

-1

Sulfate

SO4

-2

Sulfite

SO3

-2

Phosphate

PO4

-3

Hydroxide

OH-1

Cyanide CN-1

Ammonium

NH4

+1

Writing & Naming Ternary
Ionic Compounds

Formula to Name
▪ Name the metal

▪ Name the polyatomic

ion

Name to Formula

▪ Determine the symbol of

the element and the
polyatomic ion.

▪ Cross the charges

A ternary ionic compound will contain an element bonded to a polyatomic ion, which is a
charged group of atoms acting as a single unit.

Co2(SO4)3

Cobalt (III) Sulfate

CalciumNitrate

Ca NO3( )2

+2 -1

Polyatomic Ions
Nitrate

NO3

-1

Nitrite

NO2

-1

Sulfate

SO4

-2

Sulfite

SO3

-2

Phosphate

PO4

-3

Hydroxide

OH-1

Cyanide CN-1

Ammonium

NH4

+1

Writing & Naming Ternary Ionic Compounds

Practice

▪silver (I) nitrate ____________________

▪CuSO4 ________________________

▪lithium nitrite ____________________

▪Zn3(PO4)2 _______________________

▪potassium hydroxide ______________

▪Pb(NO3)2 ______________________

▪

Polyatomic Ions
Nitrate

NO3

-1

Nitrite

NO2

-1

Sulfate

SO4

-2

Sulfite

SO3

-2

Phosphate

PO4

-3

Hydroxide

OH-1

Cyanide CN-1

Ammonium

NH4

+1