What element has the symbol 'Po'?

The story behind the answer

Polonium is the element with symbol Po. The other options have different symbols: Palladium is Pd, Phosphorus is P, and Plutonium is Pu. So if you see Po, think Polonium.

Discovered in 1898 by Marie and Pierre Curie, Polonium was named after Marie’s homeland, Poland (Latin: Polonia). It’s highly radioactive—its isotope Po‑210 is notorious from poisoning cases—so it’s memorable for both its name origin and its potency. Memory tip: “Po for Poland → Polonium,” while “Pu is the