A number of substances and their chemical formulas are listed below. Check the ones that are compounds.

A compound contains atoms of at least two different elements chemically bonded together. Carbon monoxide (CO) contains carbon and oxygen, and glucose (C6H12O6) contains carbon, hydrogen, and oxygen, so both are compounds. Neon and cobalt are single elements; fluorine (F2) is made of two atoms of the same element, so it is not a compound.

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