Atomicity can be defined as the number of atoms in a molecule. Atomicity can be defined for both elements as well as other substances. For example, nitrogen gas is made up of two individual atoms of the element nitrogen and has a chemical formula of N2. That is, each molecule of nitrogen gas contains 2 atoms and thus, nitrogen gas has an atomicity of 2. We can similarly calculate the atomicity of other elements.
Water is made up of atoms of oxygen and hydrogen, mixed in a fixed 1:2 ratio (1 atom of oxygen and 2 atoms of hydrogen). It has a chemical formula of H2O and since it contains 2 atoms of hydrogen and 1 atom of oxygen, each water molecule has an atomicity of 3. We can similarly calculate the atomicity of other substance.
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