Ionic bonding
Sodium and chlorine
NaCl
Bonding in Magnesium Oxide
More than one electron may be transferred
between atoms in ionic bonding.
Mg
2.8.2.
Magnesium
atom
O
Magnesium Oxide
2.6
Oxygen
atom
O2-
Mg2+
2.8
2.8
Draw a simplified bonding diagram (omitting
inner shells) for magnesium oxide.
Mg
O
Magnesium Oxide
Magnesium
atom
Oxygen
atom
Mg2+
O2-
Calcium and chlorine
Cl
-
CaCl2
Activity
Draw bonding diagrams for the compounds formed
from the following atoms:
1. Lithium and fluorine
2. Sodium and oxygen
3. Magnesium and sulphur
Remember that the total number of
electrons lost by the metal must equal
the total number of electrons gained by
the non-metal
Opposites attract – lattices
The oppositely charged ions are attracted into a
lattice that gets bigger and bigger until it consists
of millions of ions
+
+
+
+
+
-
-
-
+
-
+
-
+
-
+
attract
-
opposites
+
+
-
And ion, and
ion, and ion!
Lattices are 3-Dimensional
We have shown ions attracting and
building into a 2 dimensional sheet.
In fact the whole process will be
going on in three dimensions to
build up a giant 3-D lattice.
And so on to
build a giant 3D lattice with
millions of
ions.
-+ +- -+ +- -+ +- + - + - +
+ -+ + -+ + -+
-+ - -+ - -+ -+ +- -+ +- -+ +- + - + - +
+
-
+
-
+
-
+
-
+
+
- +- + - +
- + + - -- +
+ -- ++ -+ +- -+
+
Properties of ionic compounds
What are ionic compounds like?
Homework: For Wed
• Under the apparatus: write a method for
your experiment
• Under the results table, write a
CONCLUSION to your experiment. Use
pages 42-43 to help you with your
explanation
What are ionic compounds like?
Melting and
boiling points?
Solubility?
Conductivity?
Structure?
Naming compounds
Metal and non-metal
The name of the metal goes first, the nonmetal changes the ending to “ide”
NaCl
MgS
CuO
Sodium chloride
Magnesium Sulphide
Copper Oxide
Metal and Non-metal (including
oxygen)
The metal goes first, and the ending of the
non-metal changes to “ate”
CuSO4
MgSO4
Ca(NO3)2
Copper sulphate
Magnesium sulphate
Calcium Nitrate
Naming compounds
Copy the following formulae and then
write the name of each compound;
1. NaBr
2. FeSO4
3. KNO3
4. FeS
5. AgNO3
6. FeO
7. CsF
8. Al2O3
9. CoCl2
10. H2O
What are the names of:
1.
2.
3.
4.
5.
CuO
Cu2O
ZnCO3
Fe(NO3)2
Fe(NO3)3