Respuesta :

badbananas3

Answer:  copper wire

Explanation:

Copper wire is not an example of a pure element because although it's made by pure elements, it's not one itself.

DoomOfDarkness

Answer: O2

Explanation:

Co2 is a pure mixture while O2 is a substance, but oxygen by itself is an element. Copper in any form, wire, bar, tube is still an element. Shape does not affect an element being an element.

Ar is a pure element.