What are the rules to be followed while writing a chemical formula of a compound?
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The rules that you have to follow while writing a chemical formula are as follows:
In compounds formed with polyatomic ions, the number of ions present in the compound is indicated by enclosing the formula of ion in a bracket and writing the number of ions outside the bracket.
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Rules for writing a chemical formula :
- 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. Two metals do not join up to form compounds.
- Write the valency of each element / ion.
- Interchange the valencies of the elements / ions and write as the subscript. Write them close together and ignore ‘1’ to obtain the formula.
- The radical / polyatomic ions must be written in brackets, before the subscript is written. In case the number of polyatomic ion is one, the bracket is not required. For example – NaOH.
- Whenever applicable, write simple ratios of the valencies.
- The final formula must be written without any sign of the charge.
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