Q. Who discovered Potassium? Answer:
Humphry Davy
Notes: Potassium metal was first isolated in 1807 in England by Sir Humphry Davy, who derived it from caustic potash (KOH, potassium hydroxide) by electrolysis of molten KOH with the newly discovered voltaic pile. Potassium was the first metal that was isolated by electrolysis. A few months after discovering potassium, Davy used the same method to isolate sodium.