Question

What should we know to write the chemical formula of a compound?

Answer 1

Chemical formula: The chemical formula of a molecule employs symbols to denote the molecule of an element or of a compound.

• The rule of writing chemical formulas is that we have to know is the valency of the elements and then interchange them with each other.
• When a compound consists of a metal and a non-metal, the name or symbol of the metal is written first. Whereas non-metals are written on the right.
• In compounds formed with polyatomic ions, the ion is enclosed in a bracket before writing the number to indicate the ratio.