Which of the following is not a molecule?

O

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O_{2}

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C O_{2}

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N_{2}

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Solution

The correct option is A $O$
A molecule may be homonuclear, that is, it consists of atoms of a single chemical element, as with oxygen ( $O_{2} o r N_{2}$ ), or, it may be heteronuclear, a chemical compound composed of more than one element, as with water ( $H_{2} O o r C O_{2}$ ). Out of all the options, $O$ represents a single oxygen atom and not a molecule.

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