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Because copper is considered an element, and because elements do not include other elements, copper only contains copper.
Copper and zinc are not alloying elements for steels.
Copper oxide is composed of copper and oxygen atoms. The two elements in copper oxide are copper and oxygen.
Copper and Oxygen
Copper carbonate is made up of the elements copper, carbon, and oxygen.
Copper and Sulphur ONLY. Copper sulphide has the formula ' CuS'.
As elements or as compounds For example, copper occurs in its elemntal form (native copper) and as various compounds (copper sulphide, copper sulphate etc)
The two forms of copper are copper(I) and copper(II). Copper(I) is formed when copper loses one electron, while copper(II) is formed when copper loses two electrons. Copper(I) is typically bonded with elements such as chlorine or iodine, while copper(II) is commonly bonded with elements like oxygen or sulfur.
Copper is itself an element.
Copper sulfide typically contains the elements copper (Cu) and sulfur (S). The most common forms of copper sulfide are Cu2S (copper sulfide) and CuS (copper monosulfide).
Copper nitrate contains copper, nitrogen, and oxygen elements. The chemical formula for copper nitrate is Cu(NO3)2.
I Cu Copper Copper, it makes a lot of cents.