Ionic Formulas and Nomenclature

Writing Formulas

for Ionic

Compounds

Your Turn!

Ca Br

Ca⁺² Br<sup>-1


chemical formula:</sup>

calcium bromide

Answer:

K⁺¹ Br<sup>-1

chemical formula:</sup>

potassium bromide

Answer

1. Be O
2. Be²⁺ O^2-

3. BeO

beryllium oxide

​If possible, simplify the subscripts!

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

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

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