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 (10[1])that Barry Sharpless called the “cream (10[1])of the crop” (10[3])of click chemistry. (10[3]-5[1])This (10[1])metal’s (10[2])sulfate (10[2])is present (10[1])in Benedict’s and Fehling’s (10[2])reagents, (10[2]-5[1])which are used to (10[1])detect (10[2])reducing (10[2])sugars. (10[3]-5[1])Lithium and this metal (10[1])are found (-5[1])in Gilman reagents. (10[4]-5[1])This metal’s fully filled (10[1])3d orbitals (10[1])and partially filled 4s (10[1])orbital (10[1])make it the (10[1])second-lightest (10[1])element to violate (-5[1])the Aufbau (-5[1])principle. This metal produces a characteristic blue-green (10[2])color (10[3])in a flame test. (10[2]-5[2])For (10[1])10 points, (10[1])name this metal alloyed with zinc in brass, (10[1])with (-5[1])atomic (10[2])number (10[1])29 (10[1])and symbol (10[1])Cu. (10[3])■END■ (10[7])