What element has the symbol 'As'?

The story behind the answer

As is the chemical symbol for arsenic, a metalloid with atomic number 33 in group 15 (the pnictogens). The other options have different symbols: Argon is Ar, Aluminum is Al, and Astatine is At.

Arsenic is infamous for its toxicity and historical use in pigments (like Paris Green) and poisons, yet it also has modern applications—most notably in semiconductors such as gallium arsenide (GaAs) used in high-speed electronics and LEDs. Memory tip: “AS = ArSenic” (the word itself starts with As). To avoid confusion with the others, remember: Argon is “Ar” (the gas with the short symbol), Aluminum is “Al” (like Al-uminum), and Astatine is “At” (as in “at the bottom,” since it’s a heavy halogen).