This element is found at the center of two interlocked rings in Jean-Pierre Sauvage (“suh-VAZH’s”) first synthesized catenane. This element’s chloride regenerates the palladium catalyst in the Wacker process. This element catalyzes a cycloaddition that Barry Sharpless called the “cream of the crop” (10[2])of click chemistry. This metal’s sulfate is present in Benedict’s and Fehling’s reagents, (10[1])which are used to detect reducing sugars. Lithium and this metal (10[1])are found in Gilman reagents. (10[1])This metal’s fully filled 3d orbitals and partially filled 4s (10[1])orbital make it the second-lightest element to violate the Aufbau principle. This metal produces a characteristic blue-green color in a flame test. For 10 points, name this metal alloyed with zinc in brass, with atomic number 29 and symbol Cu. ■END■