Question

Group Activity
Play a game for writing formulae.
Example1: Make placards with symbols and valencies of the
elements separately. Each student should hold two
placards, one with the symbol in the right hand and
the other with the valency in the left hand. Keeping
the symbols in place, students should criss-cross their
valencies to form the formula of a compound.
Example 2: A low cost model for writing formulae: Take empty
blister packs of medicines. Cut them in groups,
according to the valency of the element, as shown in
the figure. Now, you can make formulae by fixing one
type of ion into other.
For example:
Nat
SO,
PO
Formula for sodium sulphate:
2 sodium ions can be fixed on one sulphate ion.
Hence, the formula will be: Na, SO,
Do it yourself :
Now, write the formula of sodium phosphate.​

Answer 1

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Answer 2

Explanation:

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