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Atoms and Molecules — Science STD 9 — Question

Rajasthan BoardEnglish MediumSTD 9ScienceAtoms and Molecules1 Mark
Question
Which of the following is not a molecule?
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Answer

A molecule may be homonuclear, that is, it consists of atoms of a single chemical element, as with oxygen $(\ce{O2​}$ or $\ce{N2​})$, or, it may be heteronuclear, a chemical compound composed of more than one element, as with water $(\ce{H2O}$ or $\ce{CO2}​)$.
Out of all the options, $O$ represents a single oxygen atom and not a molecule.

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