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We know the no.of atom present in an element is known as its atomicity.Since oxygen contains 2 atoms so its atomicity is2.
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Atomicity is nothing but the number of atoms in a molecule of Oxygen.In this case, oxygen molecule, or O₂, is the small number below the symbol or , atoms. Thus atomicity of a substance is the m=number of atoms present in it. eg: Atomicity of Ozone is 3, as the subscript is  O₃.
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