Question

What is a Chemical formula ? What rules should be followed while writing a
Chemical formula ?​

Answer 1

• A chemical formula identifies each constituent element by its chemical symbol and indicates the proportionate number of atoms of each element
• Rules for writing a chemical formula

1. Write down the symbols of the elements / ions, which combine to form a molecule of the compound, side by side. ...
2. Write the valency of each element / ion.
3. Interchange the valencies of the elements / ions and write as the subscript. ...
4. The radical / polyatomic ions must be written in brackets, before the subscript is written.