|Step 5: For
determining the Chemical Formula all the pieces are
arranged - Yellows (positive ions) on the left and Reds
(negative ions) on the right as shown below:
Step 6: 1. To find the chemical formula the players join
the jigsaw pieces of the respective ions. For e.g. the
educator says "Sodium Chloride"; the players
2. The player picks up the root ion card - Sodium or Na+
and places it as below:
3. Then the player
picks up the other ion card, Chloride or Cl- and places
it against the root ion
Na++ Cl- = NaCl
Sodium Chloride Sodium Chloride
Then the player counts the number of pieces of each ion
i.e. 1 Na (Sodium) and 1 Cl (Chloride) gives the formula
Yet another example:
1. The educator says Calcium Chloride. The players write
2. The players then pick up the root ion card - Calcium
or Ca++ and place it as below:
3. Then the players
pick up the other ion card, Chloride or Cl- and place it
against the root ion. Immediately the players realise
that the picture is incomplete and that one more piece is
required to complete the picture.
Then the players counts
the number of pieces of each ion i.e. 1 Ca (Calcium) and
2 Cl (Chloride) gives the compound CaCl2.
Step 7: To check, the
educator sees the formula and also the various pieces
fitted together to confirm answers.
1. Valency is one of
the most fundamental concepts in chemical bonding,
chemical reactions, etc. This game is used to help
children learn the concept of valency and its application
All atoms have electrons and protons. Electrons are
arranged in concentric orbitals around the nucleus.
Orbitals can accommodate 2 electrons in the first, 8 in
the next 2, then 18 in the next 2 and so on. Electrons in
the outer orbitals are loosely bound to the nucleus due
to the distance. All atoms try to attain the stable octet
state (8 electrons in the outermost orbital). For this
they either lose or gain electrons whichever is easier.
Valency is the minimum number of electrons that any atom
loses/gains to reach a stable state (octet state).
Valency thus determines how active or passive an ion is.
Ions which can easily lose or gain an electron to reach a
stable state are highly reactive.
2.The game may also be extended to helping children
understand and remember significant chemical and physical
properties of various ions. These properties may be
printed on the reverse of the cards and then these cards
can be used as flash cards.
3.Children can learn to balance simple chemicals
equations with the help of this game. For e.g. the simple
a) CuSO4 + Mg MgSO4 +
b) ZnSO4 + MgCl2 MgSO4
Mg displaces Zn in Zinc
Teaching Learning Materials (TLM)
can make learning much more effective and fun in classrooms.
Taleem is an initiative in this direction.
4. There is also an element of cognition in this game as
children develop a mental picture of the various ions and
given two ions they immediately tell the formula without
having to play the game. They are now able to play the
game in their mind.