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What are the rules you have to follow wh...

What are the rules you have to follow while writing a chemical formula?

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1. The valancies or charge on the ion must balance.
2. When a compound consists of metal and non-metal , the name of the symbol of metal is written first. Eg: calcium oxide (CaO)
3. In compounds formed with poly atomic ions, the ion is enclosed in a bracket before writing the number to indicate the ratio.
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