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Ellie2492
CO because it is the chemical symbol for the element cobalt whereas the rest are compound. H20 is water, CO2 is carbon dioxide and N2 is dinitrogen.

Answer: [tex]N_2[/tex]

Explanation:

Element is a pure substance which is composed of atoms of similar elements.

It can not be decomposed into simpler constituents using chemical reactions.Example: Nitrogen [tex](N_2)[/tex]

Compound is a pure substance which is made from atoms of different elements combined together in a fixed ratio by mass.

It can be decomposed into simpler constituents using chemical reactions. Example: carbon dioxide [tex](CO_2)[/tex] , water [tex](H_2O)[/tex], carbon monoxide [tex](CO)[/tex]

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