what is atomicity of gas?explain briefly

Hi Madan,
Atomicity is the number of atoms of an element present in one molecule of that element.
For example, there are 2 atoms of hydrogen present in H2 molecule. So its atomicity is 2.
The gases can be
·  monatomic, example: Helium (He)
·  diatomic, example: hydrogen (H2)
·  triatomic , example: ozone (O3)
·  polyatomic, example:  sulphur (S8).
 
Hope it is clear to you.
Best Wishes!

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