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What should one ensure while writing a chemical formula?
A Chemical formula is a symbolic representation of a molecule’s composition.
It indicates the elements that are present in the compound and the ratio of these elements in the compound.
In order to write a chemical formula, the following steps should be ensured is done correctly:
Step 1- Write down the symbols of the elements/ions, which combine to form a molecule of the compound, side by side. (While writing the formula of a compound containing a metal and a non-metal, the symbol of the metal is written first followed by that of the non-metal.)
Step 2- Write the valency of each element /ion.
Step 3- Interchange the valencies of the elements /ions and write as the subscript. Write them close together and ignore ‘1’ to obtain the formula.
Step 4- The radical/polyatomic ions must be written in brackets before the subscript is written. In case the number of polyatomic ions is one, the bracket is not required. For example – NaOH.
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