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[1])of click chemistry. (10[1])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 are found in Gilman reagents. This metal’s fully filled 3d orbitals and partially filled 4s 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■