what is the role of valency in a chemical formula
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The chemical formula for a substance shows how many atoms of each element are present in a molecule, or the proportion of atoms of each element. The formula can be worked out using the valency. Valency is the combining power of an element
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The valency of an element is related to how many electrons are in the outer shell. The noble gases have the valency 0 as they do not usually combine with other elements. To write the chemical formula for a compound it is best to use the S.V.S.D.F system.V - beneath each symbol, write it's valency.
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