Question

if copper reacts with oxygen, is it still an element?

Answer 1

Answer:

copper with oxygen is an element

Explanation:

when copper reacts with oxygen it forms copper oxide which is made up of two elements copper and oxygen. As it is made up of two elements it is a compound.

Answer 2

if copper reacts with oxygen, it is not an element.

Heated copper metal reacts with oxygen to form the black copper oxide. The copper oxide can then react with the hydrogen gas to form the copper metal and water.