Groups
1
Groups
2
3
4
5
6
7
0
The periodic
table
for ionic
bonding
Metals
Non metals
Starter: (3 minutes)
• On your periodic table can you draw a separating
line between the metals and non-metals
• Place the following labels onto the correct
groups
– Alkali metals
– Alkali-Earth metals
– Halogens
– Noble gases
Atomic Number= No. of
Electron
Atomic Mass= No. of
Protons + Neutrons
Using the
cards –
Match up the
element’s
symbol with
its atomic
structure
Topic: Ionic Bond
Tahira Bibi
Ionic bonding
lesson objective:
To understand how ionic bonding occurs between atoms
Btec -Working towards
Lesson outcomes:
pass
1. Draw dot and cross diagrams to
show ionic bonding
merit
2. Describe the formation of negative
ion and positive ion.
distinction
3. Explain how an ionic bond forms.
Ionic Bonds
• Ionic bonds are formed by one atom
transferring electrons to another atom to
form ions.
• Ions are atoms, which have lost or gained
electrons and therefore have a negative or
positive charge
why do atoms bond?
Atoms bond to get full ‘outer’ shells of electrons
(usually 8)
…. because that makes them happy!!!
Cl
Okay
Hi. My name’s
Colinmy
Chlorine.
Here comes
friend, Sophie Sodium
I’m in Group 7, so I have 7
electrons in my outer shell. I’m
not very happy. I want a full
Hey Colin.
outer I’m
shellin Group 1 so I have one
electron in my outer shell. This electron
is far away from the nucleus so I’m quite
happy to get rid of it. Do you want it?
+
Na
Na
-
Cl
Now we’ve both got full outer shells
and we’ve both gained a charge.
We’ve formed an IONIC bond.
• The atom losing electrons forms a positive ion and
is usually a metal.
Sodium atom
+
+
+
+
+
+
+
+
+
+
+
-
• The atom gaining electrons forms a negative ion
and is usually a non-metallic element.
+
+
+
+
+
+
+
+
+
+
-
+
+
+
+
+
+
+
+
-
XXXX
X
X
XX
X
X X
XX
X X
X X
Chlorine atom
Sodium atom
Chlorine atom
Electron
transfer
XXXX
X
X
XX
X
X X
XX
X X
X X
+
-
Loses
electron
Gains
electron
Positive and negative ions
attract
Ionic
bonding
Sodium Chloride
XXXX
X
X
XX
X
X X
X X
-
+
Positive and negative ions
attract
X X
XX
DRAWING IONS
Part 1:
• Magnesium (2,8,2) and Oxygen (2,6)
(2 marks)
Part 2:
Now try this – you will have to draw your own diagrams
• Magnesium (2,8,2) and Sulphur (2,8,6)
(3 marks)
EXTENSION TASK: If you finish, try to draw another ionic
compound, Sodium Oxide (It’s a bit tricky!)
(3 marks)
What is an ionic bond?
ELECTRONS to another to form the bond.
Atoms will transfer one or more ________________
Each atom is left with a ________________
COMPLETE outer shell.
An ionic bond forms between a ___________
METAL ion with a positive charge and a
________________
NONMETAL ion with a negative charge attracting each other.
Example: Sodium + Chlorine
XXXX
X
X
XX
X
X X
X X
Sodium chloride
X X
XX
Answer these questions:
NEGATIVE
An atom that gains one or more electrons will have a ____________________
charge.
POSITIVE
An atom that loses one or more electrons will have a ____________________
charge.
ION
An atom that gains or loses one or more electrons is called an ____________.