What is the systematic name for CuCl2?

The systematic name for CuCl2 is Copper(II) chloride. In this compound, copper exhibits a +2 oxidation state, which is key to correctly naming the compound. The Roman numeral II indicates the charge on the copper ion, distinguishing it from the +1 oxidation state, where copper would be named Copper(I) chloride.

In the formula CuCl2, the presence of two chloride ions (Cl-) is balanced by one copper ion, which must therefore have a +2 charge to achieve electrical neutrality. This is why the systematic naming convention includes the Roman numeral indicating the oxidation state of copper.

Simply calling it "Copper chloride" doesn't provide the necessary information about the oxidation state, while "Chloride copper" lacks clarity and does not conform to accepted nomenclature rules. By providing the oxidation state, Copper(II) chloride communicates both the identity of the metal and its specific charge, adhering to the principles of systematic naming in chemistry.