What element has the symbol 'Au'?

Au is the symbol for gold, from the Latin word “aurum,” meaning “shining dawn.” Gold (atomic number 79) is dense, highly malleable, and famously unreactive, which is why it resists tarnish and is prized for jewelry, coins, and reliable electrical contacts. The other options have different symbols: Aluminum is Al, Argon is Ar, and Uranium is U. Memory tip: Think “Aurum = Au = gold,” or imagine shouting “A U! Give me back my gold!” to link the letters to the precious metal.