Rules for writing chemical formulae

Rules for writing chemical formulae

(i) We first write symbols of elements which form compound.
(ii) Below the symbol of each element, we should write their valency.
(iii) Now cross over the valencies of combining atoms.
(iv) With first atom, we write the valency of second atom (as a subscript).
(v) With second atom, we write the valency of first atom (subscript).
Examples :

 

 

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