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” of click chemistry. This metal’s sulfate (10[1])is present in Benedict’s and Fehling’s reagents, which are used to detect reducing sugars. (10[1]-5[1])Lithium and this metal are found in Gilman reagents. This metal’s fully filled 3d orbitals (10[1])and partially filled 4s orbital (10[1])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 (10[2])number 29 (10[1])and symbol Cu. ■END■ (10[1])