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Chemical Formula
Elements can combine to make molecules.
Molecules can also be represented by symbols called chemical formula or molecular formula. It consists of a number of atom symbols that represent the constituent of the elements that made up the molecule.
Two or more elements are joined together via chemical bonds to form molecules. They are called chemical compounds.
There are strict chemical rules that determine how a bond is formed. This, in turn, determines the number of elements that can involve to form a compound.
In general, there are two types of chemical bonds - the covalent bond and the ionic bond. These bonds subsequently form covalent compounds or ionic compounds.
An ionic bond is formed by atoms with opposite charges attract to each other by electrostatic forces to give the ionic molecule.
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A covalent bond is formed by sharing two electrons between two atoms. These electrons 'glue' the two atoms together to give the covalent molecule.
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