1. Ionic formulae and names
MgO has a melting point of 2,852 C. (because of strong electrostatic forces Mg2+ and O2-) compared with sodium chloride 801 C

2. Key words/terms Polyatomic atoms Carbonate Nitrate Sulfate Hydroxide
Students to copy down key words/terms and leave a line to add definition later in lesson
January 1, 2019

3. Introduction
We looked at forming ions last lesson and we can link this to both electronic structure and the periodic table 1+ 2+ 3+ 3- 2- 1-
Teacher needs to explain that the group and therefore electronic structure dictate the charge the ion will have in this group.
January 1, 2019

4. Naming ionic compounds
Almost all ionic compounds have a two word name
Cation
Anion
Ionic compound
Sodium
Chloride
Sodium chloride
Lithium
Bromide
Lithium bromide
The ending of the anion is usually the part that changes, mostly to –ide. This tells us they contain only atoms from one element
January 1, 2019

5. -ates and -ides -ides -ates Some common anions ending in –ide
Chloride - 𝐶𝑙 −
Fluoride - 𝐹 −
Bromide - 𝐵𝑟 −
Oxide - 𝑂 2−
Hydroxide - 𝑂𝐻 −
-ates contain oxygen and another element
Carbonate - 𝐶𝑂 2−
Sulphate - 𝑆𝑂 4
Nitrate - 𝑁𝑂 − 3 2- 3
January 1, 2019

6. Chemical formula Compound name
MgO
NaCl
LiBr
Ca Cl 2
NaOH
Cu SO 4
Ca CO 3
Na NO 3
FeS
Cu CO 3
Magnesium oxide
Sodium chloride
Lithium Bromide
Calcium chloride
Sodium hydroxide
Copper sulfate
Calcium carbonate
Sodium nitrate
Iron sulfide
Copper carbonate
January 1, 2019

7. Writing chemical formula
Cations
Anions +1 +2 +3 -1 -2
Lithium - 𝐿𝑖 +
Magnesium - 𝑀𝑔 2+
Aluminium - 𝐴𝑙 3+
Chloride - 𝐶𝑙 −
Oxide - 𝑂 2−
Sodium - 𝑁𝑎 +
Calcium - 𝐶𝑎 2+
Bromide - 𝐵𝑟 −
Sulphide - 𝑆 2−
Potassium - 𝐾 +
Barium - 𝐵𝑎 2+
Iodide - 𝐼 −
Sulfite - 𝑆𝑂 2−
Ammonium - 𝑁𝐻 4
Iron (II) - 𝐹𝑒 2+
Nitrate - 𝑁𝑂 −
Sulphate - 𝑆𝑂 4
Hydrogen - 𝐻 +
Copper - 𝐶𝑢 2+
Hydroxide - 𝑂𝐻 −
Carbonate - 𝐶𝑂 3 3 2- 3 2-
Ionic compounds in symbols are called chemical formula, these save time and give us the correct ratio of elements present. We need the charge of both anion and cation to write them
January 1, 2019

8. Writing chemical formula
Step 1: write down the name
Step 2 Write down the correct formula for each ion
Step 3 balance the charges so that the compound is neutral
Example
Step 1: sodium sulphate
Step 2: 𝑁𝑎 + and 𝑆𝑂 4
Step 3: 𝑁𝑎 + 𝑁𝑎 + 𝑆𝑂 (Notice we need 2 sodium to balance)
Step 4: 𝑁𝑎 2 𝑆𝑂 4 2- 2-
January 1, 2019

9. Alternative method – cross over3 2 Al O
This can be used to supply additional support for students who have difficulty balancing charge independently O Al 2 3
January 1, 2019