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Earlier discussion
1 older comment kept for context.
Oluwaseun Adeyemi
Atomicity refers to the number of atoms within a molecule of a substance. Example the noble gases (He, Ne, Xe, Kr) are monoatomic Chlorine, Oxygen, Nitrogen (Cl\(_2\), N\(_2\), O\(_2\)) are diatomic. The ozone molecule is triatomic and is denoted as 0\(_3\).