What is a chemical formula? What is the rule for writing a formula correctly?

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While writing the formula, valency plays no role.

The chemical formula is the representation of the smallest ratio of the number of atoms of each type of element.

The chemical formula is the representation of the number of atoms of each type of element.

While writing the formula, valency is balanced.

answer is A, C.

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Detailed Solution

A chemical formula is a visual depiction of the constituent parts of a compound as well as their precise ratios. The chemical name for carbon dioxide is CO₂, for instance. We may infer from the chemical formula that one molecule of carbon dioxide has one carbon atom and two oxygen atoms. Because a chemical formula lists the components and their ratios, knowing the chemical formula of each substance is crucial for humans. We can also gain a rough understanding of the species present in the compound, such as ionic, neutral, or radical species.

A chemical formula represents the elements present along with the ratio present.

We can also get a slight idea about the kind of species such as ionic, neutral, or radical present in the compound.

The rules for writing the chemical formula are:

The chemical formula is written in such a way that an anion is always written on the right side and the cation is always written on the left.
In the case of metal and non-metal, the symbol of non-metal is always written first and then the symbol of non-metal.
The valency of the elements must be balanced.

Hence, options (A) and (C) are correct.

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