How is valency helpful in writing the chemical formula? Which one of the following statement is correct?

Formula can be written by balancing the valencies of the different atoms.

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Formula can be written by reducing the valencies of different atoms.

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Formula can be written by balancing the valencies of the same atoms.

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Formula can be written by balancing the moles.

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Solution

The correct option is A
Formula can be written by balancing the valencies of the different atoms.

If a compound is made of hydrogen and sulphur elements, then we can adjust the number of hydrogen atoms and sulphur atoms in such a way that the total valencies of hydrogen atoms becomes equal to the total valencies of sulphur atoms. So, formula of compounds can be obtained by balancing the valencies of the different atoms .

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Statement 1: An atom of valency 2 can combine with 2 other atoms of valency 1.
Statement 2: To write the chemical formula, one must know the valency of the element.

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