WRITING CHEMICAL FORMULAE
every compound is represented by a formula. The following steps should be taken while attempting to write a formula. The method is called
criss-cross method.
1.Write the symbols side by side, basic radical is written first and then acidic radical.
ii) Write the valency of each atom on top of its symbol.
(iii) Divide the valency numbers by their highest common factor (H.C.F), if any, to get the simple ratio. Ignore the (+) or( -) symbols of the radicals.Interchange the valencies of the radicals.
iv) Write the interchanged valency numbers to the lower right of the radicals. If the radical is a
group of atoms and has a valency number more than 1, enclose it within brackets.
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