+1 (Cuprous): Copper can exhibit a +1 oxidation state, also known as the cuprous state. This is commonly seen in compounds such as copper(I) oxide (Cu2O) and copper(I) chloride (CuCl).
+2 (Cupric): Copper commonly shows a +2 oxidation number, referred to as the cupric state. This is the most common oxidation state for copper and is found in compounds like copper(II) oxide (CuO), copper(II) sulfate (CuSO4), and copper(II) chloride (CuCl2).
Less Common Oxidation States: In certain circumstances, copper can also exhibit other oxidation states, such as +3 (cupric) in compounds like potassium copper(III) fluoride (K3CuF6), and +4 (cupric) in compounds like cesium copper(IV) fluoride (Cs2CuF6).
It's important to note that the oxidation state of copper in a compound can be determined by considering the charges of the other atoms or ions present, and ensuring that the overall charge of the compound is balanced.