# Is copper reactive?

Of course. You can see clear evidence of many copper compounds that have been synthesized. $\text{CuCl}$, ${\text{CuCl}}_{2}$, "Cu"("OH")_2, $\text{CuO}$, $\text{Cu"_2"O}$, . . . etc. Hence, copper is reactive.
It is a ${d}^{10}$ metal with one $4 s$ electron. Thus, it can react to form compounds involving "Cu"("I") or "Cu"("II") as the most common cations of copper.