What element has the symbol 'Am'?

The story behind the answer

Am is the symbol for Americium, element 95 in the actinide series. It’s a synthetic, radioactive metal discovered in 1944 at UC Berkeley. The other options have different symbols: Aluminium is Al, Antimony is Sb (from its Latin name stibium), and Argon is Ar.

Americium is famously used in many household ionization smoke detectors (americium-241), where it helps detect tiny particles from smoke. A handy memory tip: “Am = American-made,” since Americium was first made in America and named after the Americas—much like Europium is named after Europe.