Ionic Formulas and Nomenclature

Writing Formulas

for Ionic

Compounds

​1. Write the chemical formula for each element (metal, then nonmetal)
Mg Cl
2. Determine each ionic charge and write it with the symbols
Mg⁺² Cl^-1
3. Criss, cross, and drop! Do NOT bring the signs (+ and -) down.
Mg₁Cl₂
4. We do not write in 1's. Reduce if possible!
MgCl₂

Your Turn!

Ca Br

Ca⁺² Br<sup>-1


chemical formula:</sup>

calcium bromide

Draw

What is the chemical formula produced between calcium and bromine?

Answer:

K⁺¹ Br<sup>-1

chemical formula:</sup>

potassium bromide

Draw

What is the chemical formula between potassium and bromine?

Multiple Choice

What is the chemical formula between beryllium (Be) and oxygen (O)?

• BeO

• Be₂O₂

• BeO₂

• Be₊₂O_-2

Answer

1. Be O
2. Be²⁺ O^2-

3. BeO

beryllium oxide

​If possible, simplify the subscripts!

Multiple Choice

What is the chemical formula between aluminum (Al) and sulfur (S)?

• AlS

• Al⁺³S^-2

• Al₃S₂

• Al₂S₃

Your Turn!

1. Al S
2. Al³⁺ S^2-

3. Al2S3

Aluminum sulfide

Naming Ionic Compounds

Rules For Naming Ionic Compounds

•The cation keeps the element name.

�REMEMBER: the cation has the + charge
�Examples: cesium +1

calcium +2

aluminum +3

•The anion gets suffix of “ide”

�Examples: fluorine ------fluoride

oxygen----------oxide
nitrogen-------nitride

​Is there a transition metal?
Yes, element name with Roman Numerals to show the charge
No, element name

Is there a polyatomic ion?
Yes, write the name from the chart
No, element name with "-ide" ending

Naming Ionic Compounds

• LiCl

Name=

​​Is there a transition metal?
Yes, element name with Roman Numerals to show the charge
No, element name

Is there a polyatomic ion?
Yes, write the name from the chart
No, element name with "-ide" ending

Naming Ionic Compounds

• LiCl

Name= lithium chloride

​​Is there a transition metal?
Yes, element name with Roman Numerals to show the charge
No, element name

Is there a polyatomic ion?
Yes, write the name from the chart
No, element name with "-ide" ending

Naming Ionic Compounds

• CaO

Name=

​​Is there a transition metal?
Yes, element name with Roman Numerals to show the charge
No, element name

Is there a polyatomic ion?
Yes, write the name from the chart
No, element name with "-ide" ending

Naming Ionic Compounds

• CaO

Name= calcium oxide

​​Is there a transition metal?
Yes, element name with Roman Numerals to show the charge
No, element name

Is there a polyatomic ion?
Yes, write the name from the chart
No, element name with "-ide" ending

Multiple Choice

Name the following ionic compound: BeCl₂

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

Multiple Choice

What is the name of AlP?

• aluminum phosphide

• aluminum (III) phosphide

• aluminum phosphate

• aluminum phosphorus

Rules For Naming Ionic Compounds With Transition Metals
•The transition metal cation still keeps the element name.
�REMEMBER: metals become cations, and transition metals are METALS so they have positive charges

�REMEMBER: transition metals can have multiple charges, so the compound name MUST tell us the charge! We get this from the compound subscripts and write it in Roman Numerals

• Iron with +2 charge…..iron (II)
• Iron with +4 charge…iron (IV)

•The anion still gets suffix of “ide”...no changes here!

Naming Ionic Compounds with transition metals

















• FeCl2

Name=

​​​Is there a transition metal?
Yes, element name with Roman Numerals to show the charge
No, element name

Is there a polyatomic ion?
Yes, write the name from the chart
No, element name with "-ide" ending

Naming Ionic Compounds with transition metals















• FeCl2

Name=

​​​Is there a transition metal?
Yes, element name with Roman Numerals to show the charge
No, element name

Is there a polyatomic ion?
Yes, write the name from the chart
No, element name with "-ide" ending

​where is iron's charge??? Work backwards! We know chlorine's charge is -1

Naming Ionic Compounds with transition metals















• FeCl2

Name=

​​​Is there a transition metal?
Yes, element name with Roman Numerals to show the charge
No, element name

Is there a polyatomic ion?
Yes, write the name from the chart
No, element name with "-ide" ending

So iron's charge here is +2!

Naming Ionic Compounds with transition metals















• FeCl2

​​​Is there a transition metal?
Yes, element name with Roman Numerals to show the charge
No, element name

Is there a polyatomic ion?
Yes, write the name from the chart
No, element name with "-ide" ending

So iron's charge here is +2!

Name= iron (II) chloride

Naming Ionic Compounds with transition metals















• Pb₃N₄

Name=

​​​Is there a transition metal?
Yes, element name with Roman Numerals to show the charge
No, element name

Is there a polyatomic ion?
Yes, write the name from the chart
No, element name with "-ide" ending

Naming Ionic Compounds with transition metals















• Pb₃N₄

Name= lead (IV) nitride

​​​Is there a transition metal?
Yes, element name with Roman Numerals to show the charge
No, element name

Is there a polyatomic ion?
Yes, write the name from the chart
No, element name with "-ide" ending

Multiple Choice

What is the name of the following compound: Cu₂N

• copper nitride

• copper (III) nitride

• copper (I) nitride

• copper (III) nitrogen (I)

Multiple Choice

Name the following compound: W₂S₃

• tungsten sulfide

• tungsten (II) sulfire

• tungsten sulfur

• tungsten (III) sulfide

Rules For Naming Ionic Compounds With Polyatomic Ions

•The metal cation still keeps the element name.

�REMEMBER: if it is a transition metal, use Roman Numerals

•The polyatomic anion KEEPS THE NAME IT HAS!!!

� Examples:

NO3^-1

nitrate

SO4^-2

sulfate

CO3^-2

carbonate

Naming Ionic Compounds with transition metals















• Na₂(SO₄)

Name=

​​​Is there a transition metal?
Yes, element name with Roman Numerals to show the charge
No, element name

Is there a polyatomic ion?
Yes, write the name from the chart
No, element name with "-ide" ending

Naming Ionic Compounds with polyatomic ions















• Na₂(SO₄)

Name= sodium sulfate

​​​Is there a transition metal?
Yes, element name with Roman Numerals to show the charge
No, element name

Is there a polyatomic ion?
Yes, write the name from the chart
No, element name with "-ide" ending

Naming Ionic Compounds with transition metals















• Fe(OH)₂

Name=

​​​Is there a transition metal?
Yes, element name with Roman Numerals to show the charge
No, element name

Is there a polyatomic ion?
Yes, write the name from the chart
No, element name with "-ide" ending

Naming Ionic Compounds with transition metals















• Fe(OH)₂

Name= iron(II) hydroxide

​​​Is there a transition metal?
Yes, element name with Roman Numerals to show the charge
No, element name

Is there a polyatomic ion?
Yes, write the name from the chart
No, element name with "-ide" ending

Multiple Choice

How would you name the compound Na₃PO₄

• sodium phosphide

• sodium phosphate

• sodium phosphite

• sodium (III) phosphate

Multiple Choice

How would you name the compound Li₂CO₃

• lithium carbonate

• lithium (I) carbonate

• lithium (III) carbonate

• lithium carbonide

Multiple Choice

How would you name the compound Cr₂(SO₄)₃?

• chromium (I) sulfate

• chromium sulfate

• chromium (II) sulfate

• chromium (III) sulfate