1. 3.2 Naming Ionic Compounds

2. Learning Goals Be able to name ionic compounds
Be able to write formulas of ionic compounds
Be able to name Ionic Compounds containing Multivalent
Be able to name Ionic Compounds containing Polyatomic Ions

3. A chemical name indicates the elements present in the compound
All ionic compounds are composed of positive(+) and negative(-) ions which can be described by using a name or formula
Ex. Zinc nitride - Zn3N2
Sodium chloride – NaCl
A chemical name indicates the elements present in the compound
The chemical name of an ionic compound always has two parts - the metal 1st and then non-metal 2nd

4. Ex: Magnesium and Bromine
Steps to naming
Steps
Ex: Magnesium and Bromine 1 2 3
Name the metal ion
Magnesium
Name the non-metal ion by ending the element name with “ide”
bromine changes to bromide
Write the name of the compound
Magnesium bromide

5. Name the following
Potassium and oxygen
Lithium and nitrogen

6. Complete the following in your notebooks
P86 Practice Problems

7. Writing Formulas Steps Ex Identify each ion charge Zinc Nitride
Zinc = Zn2+
Nitride = N3-
Aluminum Chloride
Al3+
Cl-
Determine the total charges needed to balance + and -
Zn2+ = = +6
N3- = = -6
Al3+ = +3 = +3
Cl- = = -3
Note the ratio of + and –
“SWAP N DROP”
3 Zn2+ ions for every
2 N3- ions
1 Al3+ ion for every 3 Cl- ions
Use the subscripts to write the formula
Zn3N2
AlCl3

8. Complete Practice Problems p87

9. Multivalent Ions Multivalent Ions can form more than one ion charge
to distinguish which one you are using, write the Roman Numeral of the charge in the name
Ex. Chromium (II) Fluoride = CrF2
Practice Problems pg. 89 and 90

10. Practice Problems pg. 89 and 90

11. Polyatomic Ions Steps Example Identify each ion charge (USE page 92)
Iron (III) Hydroxide
Iron = Fe3+
Hydroxide = OH-
Determine total charges
Fe3+
OH-
Note the ratio
1 Fe3+ for every 3
Use Subscripts and Brackets to write the formula. Omit brackets if only one ion is needed.
Fe(OH)3

12. Practice Problems 91
Reading Check pg.92