Correct Answer - Option 2 : Only I
Atomicity is the number of atoms present in a molecule of an element.
- On the basis of atomicity, molecules can be classified as :
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Monoatomic - composed of 1 atom e.g. He(Helium), Ne, Ar (all noble gases are monoatomic)
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Diatomic - composed of 2 atoms e.g. H2, N2, O2(Oxygen)
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Triatomic - composed of 3 atoms e.g. Ozone O3
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Polyatomic - composed of 3 or more atoms e.g. P4, S8
Hence, we can conclude that Only I statement is correct.