Iggy's Element Bonanza! Element: Copper Atomic Symbol: Cu Atomic Number: 29 Iggy: Copper is a soft, malleable, and ductile metal that has excellent thermal and electric conductivity. It reddish-orange in color, some common alloys of copper are Brass (Cu+Zn) and Bronze (Cu+Sn)! It is also one of few metals that gets dissolved by Nitric Acid. Copper has two stable isotopes, Copper-63 and Copper-65.