Why does the number of chlorine atoms differ in these compounds? Try to find out by analysing the valency of the elements `Na,Al,Cl` and `C`.
Analyse Table
Examine the above table and identify how t write the chemical formula from valency. Compare your findings with the following. First write the element with lower elctronegativity. Exchange the valency of each element and write as sufix. Divide the suffix with the common factor. If the suffix is 1, it need not be written.
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