role of valency in writing formula
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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.
S - write down the symbols of both the elements involved.
V - beneath each symbol, write it’s valency. Memorising the above table is useful.
S - swap the valencies over.
D - if the valencies can be simplified, divide them both by the smaller of the two numbers. If one of the numbers is already one, then they cannot be divided and simplified any further.
F - write the formula.
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