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 (-5[1])a cycloaddition that Barry Sharpless called the “cream (10[1])of the crop” of click chemistry. This metal’s sulfate is present in Benedict’s and Fehling’s reagents, which are used to detect reducing sugars. (10[1])Lithium and this metal are found (-5[1])in Gilman reagents. (10[1])This metal’s fully filled (10[1])3d orbitals and partially filled 4s orbital make it the second-lightest element to violate the Aufbau (-5[1])principle. This metal produces a characteristic blue-green (10[1])color (10[1])in a flame test. For 10 points, name this metal alloyed with zinc in brass, with (-5[1])atomic number 29 and symbol Cu. (10[1])■END■ (10[3])