Naming Ionic Compounds with Polyatomic Ions

Naming Ionic Compounds - Type I, II, and III

by Jessica Holmes

Type I binary ionic compounds review

Type I Ionic compounds

• Comprised of a metal ion and a nonmetal ion

• The metal anion is a cation (a positively charged ion)

• The nonmetal is an anion (a negatively charged ion)

• In Type I ionic compounds, the cations only come in one "flavor" of charge. Example: sodium is always +1

To name Type I binary ionic compounds:

• Put the cation (metal) first. Use the entire name of the metal. Example: sodium, potassium, calcium, etc.

• Put the name of the anion (nonmetal) section. Change the ending to "-ide." Example: oxide, bromide, chloride, nitride, etc.

• Ions always combine in a way that the charges balance each other. E.g., if you have one calcium (2+ charge), you need 2 chlorines (1- charge) to balance it out.

• Even if a type 1 ionic compound has two copies of an ion (e.g. CaCl₂), it will always be named using the same procedure(e.g., calcium chloride).

Multiple Choice

Which of the following is NOT an ionic compound:

• CaO
• NaOH
• BaCl₂
• Br₂

Multiple Choice

What is the correct chemical formula for magnesium chloride?

• MgCl

• Mg₂Cl

• MgCl₂

• MgCl₃

• Mg₃Cl

Multiple Choice

How do the following two elements bond together?
Na¹⁺  F^1-         

• NaF
• NaF₃
• Na₃F
• Na₁F₂

Multiple Choice

How do the following two elements bond together?
Cr³⁺  O^2-         

• CrO
• Cr₃O₂
• Cr₂O₃
• CrO₃

Multiple Choice

KCl

• Krypton Chloride
• Potassium Chlorine
• Potassium Chloride
• Potassium Monochloride

Multiple Choice

LiBr is called

• lithium bromine
• lithium (I) bromine
• lithium bromide
• lithuim (I) bromide

Multiple Choice

What is the correct formula for Sodium Oxide?

• NaO
• NaO₂
• Na₂O
• Na₂O₂

Fill in the Blank

Name the compound  $$PtS$$  

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Name the compound $$CuBr_2$$  

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Name the compound CdF₂

​We can use the ions to write the chemical formula of a type (II) compound)

​iron (III) fluoride is the bond between Fe+3 and F-1 meaning that the compound formed is:

​

​FeF3

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What is the chemical formula for the compound chromium (II) nitride?

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What is the chemical formula for the compound titanium (IV) oxide?

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What is the chemical formula for the compound copper (I) iodide?

Polyatomic Ions

There are also ions that form after elements have shared electrons. These ions are known as polyatomic ions, and each polyatomic ion already has a name.

Multiple Choice

What is the name of this polyatomic ion: CO₃^2- ?

• carbide

• carbonate

• carbonite

• chlorate

Multiple Choice

What is the name of this polyatomic ion: NO₂^1- ?

• nitride

• nitrate

• nitrite

Naming with Polyatomic Ions

• When polyatomic ions are used, simply use the name of the polyatomic ion in the compound.

• Example:

• CaSO₄

• Calcium Sulfate

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What is the name of this compound: NH₄F?

Fill in the Blank

What is the name of this compound: K₂SO₄?

Polyatomic Formulas

This is just as easy to do with polyatomic ions. You just need to use the name of the polyatomic ion.

Step 1: Write the symbol of the metal ion.

Step 2: Write the formula of the polyatomic ion.

Step 3: Determine the charges using the periodic table and the table of polyatomic ions.

Step 4: Determine the formula from the ions.

Multiple Choice

What is the correct formula for the compound: ammonium hydroxide?

• NH₄(OH)₄

• NH₅O

• NH₄OH

Multiple Choice

What is the correct formula for the compound: Lead (II) Nitrate?

• PbNO₃

• Pb(NO₃)₄

• Pb₃NO₂

• Pb(NO₃)₂

Now let's practice!

Multiple Choice

AgF

• silver fluoride
• silver fluorine
• monosilver monofluoride
• silver monofluorine

Multiple Choice

The proper formula for magnesium hydroxide:

• MgOH
• Mg₂OH
• Mg(OH)₂
• Mg₂OH₂

Multiple Choice

Name the following ionic compound: LiNO₃

• lithium nitrate
• lithium III nitrate
• lithium nitride
• lithium oxide

Multiple Choice

Name the following ionic compound: MgSO₄

• magnesium sulfoxide
• magnesium sulfide
• magnesium sulfate
• magnesium oxide

Multiple Choice

Name the following ionic compound: BeCl₂

• beryllium chlorine
• beryllium II chloride
• beryllium chloride
• beryllium dichloride

Multiple Choice

The chemical formula of lead (IV) nitrate is

• PbN₄
• PbNO₃₄
• Pb(NO₃)₄
• Pb₃NO₄

Multiple Choice

The chemical formula of iron (III)bromide is

• FeBr
• Fe(III)Br
• FeBr₃
• Fe₂Br₃

Multiple Choice

The chemical formula of iron (III)bromide is

• FeBr
• Fe(III)Br
• FeBr₃
• Fe₂Br₃

Multiple Choice

What is the formula for calcium phosphide?

• CaP
• Ca₂P₃
• Ca₃P₂
• Ca₂P

Multiple Choice

What is the formula for copper(I) sulfate?

• CuSO₃
• CuSO₄
• Cu₂SO₃
• Cu₂SO₄

Multiple Choice

The chemical formula for an ionic compound of potassium and oxygen is

• KO.
• K₂O.
• K₂O₂.
• KO₂.

Multiple Choice

The name of FeCl₂ is

• iron chloride

• iron (II) chloride

• iron (I) chloride

• iron dichloride

Multiple Choice

LiBr is called

• lithium bromine

• lithium (I) bromine

• lithium bromide

• lithuim (I) bromide

Multiple Choice

What is the name of the compound Na₂(SO₄)?

• Sodium sulfate

• Sodium sulfide

• Sodium sulfite

• Sodium sulfuroxide

Multiple Choice

What is the correct formula for Sodium Oxide?

• NaO
• NaO₂
• Na₂O
• Na₂O₂

Multiple Choice

What is the correct molecular formula for barium hydroxide?

• Ba(OH)₂

• Ba₂OH

• BaOH

• Ba₂OH

Multiple Choice

What is the formula for copper(I) sulfate?

• CuSO₃
• CuSO₄
• Cu₂SO₃
• Cu₂SO₄

​Great job! You did it!