Which of the following is an element?

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(C) An element is a pure substance consisting only of atoms that all have the same number of protons in their atomic nuclei.$A$. Carbon dioxide $(CO_2

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Oxygen gas

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(C) An element is a pure substance consisting only of atoms that all have the same number of protons in their atomic nuclei.$A$. Carbon dioxide $(CO_2)$ is a compound made of carbon and oxygen atoms.$B$. Sulphur dioxide $(SO_2)$ is a compound made of sulphur and oxygen atoms.$C$. Oxygen gas $(O_2)$ consists only of oxygen atoms,making it an element.$D$. Nitrogen dioxide $(NO_2)$ is a compound made of nitrogen and oxygen atoms.Therefore,the correct option is $C$.

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