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प्रश्न
An element A forms an oxide A2O5.
What will be the formula of chloride of A ?
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उत्तर
Formula of chloride of A:
Element / Ion A CI-
Valency 5 -1
Formula of the chloride of element A can be worked out by crossing over the valencies. Thus, the formula is ACl5.
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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.
