What are the rules to write the chemical formulas? Give examples
What are the rules to write the chemical formulas? Give examples
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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.
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Write the valency of each element/ion.
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Interchange the valencies of the elements/ions and write as the subscript. Write them close together and ignore ‘1’ to obtain the formula.
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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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Whenever applicable, write simple ratios of the valencies.
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The final formula must be written without any sign of the charge.
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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 ions 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.
