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Question
An element X of valency 3 combines with another element Y of valency 2. What will be the formula of the compound formed ?
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Solution
Valency of element X = 3
Valency of element Y = 2
Elements : X Y
Valencies : 3 2
Formula for the compound formed between X and Y can be worked out by crossing the valencies of the constituent elements.
Therefore, formula of the compound is X2Y3.
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Play a game for writing formula.
Example 1: 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.
