Oxygen is a/an and carbon dioxide is a/an __.

element, element

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element, compound

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compound, compound

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compound, element

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Solution

The correct option is B element, compound
Elements are made of only one kind of atoms while compounds are made up of two or more kinds of atoms, chemically combined, in a definite ratio.

Oxygen molecule $(O_{2})$ is made up of the same type of oxygen atoms. Hence, oxygen is an element. On the other hand, carbon dioxide $(C O_{2})$ is made up of one atom of carbon and two atoms of oxygen. Hence, carbon dioxide is a compound.

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