The valency of carbon is 4 and that of oxygen is 2. Write the molecular formula formed between these two elements.

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Solution

The valency of carbon, C is 4.
The valency of oxygen, O is 2.
Then, the molecular formula of carbon and oxygen can be determined by using the criss-cross method.
According to the criss-cross method, the numerical value of each ion is crossed over to become the subscript of the other ion.
Symbol of elements C O
Valency of elements 4 2
Molecular formula, C₂O₄ or CO₂

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