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Which of the following pair of element - atomicity is correct?

I. Helium - monoatomic

Il. Oxygen - triatomic


1. Both I and II
2. Only I
3. Neither I nor II
4. Only II

1 Answer

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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 :
    • Monoatomic - composed of 1 atom e.g. He(Helium), Ne, Ar (all noble gases are monoatomic)
    • Diatomic - composed of 2 atoms e.g. H2, N2, O2(Oxygen)
    • Triatomic - composed of 3 atoms e.g. Ozone O3
    • Polyatomic - composed of 3 or more atoms e.g. P4, S8

Hence, we can conclude that Only I statement is correct.

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