What element has the symbol 'K'?

The story behind the answer

‘K’ stands for Potassium because the symbol comes from its Latin name, kalium. That’s why “Kalium” appears in some languages, but the official English name is Potassium (element 19). Krypton’s symbol is Kr, and “Keranium” isn’t an element.

Potassium is a soft, highly reactive alkali metal in Group 1; its K+ ions are essential for nerve signals and muscle contraction. Memory tip: think “K = Kalium,” and picture a potassium-rich banana with a big letter K on it. Or remember the pair Na/K for sodium/potassium—both keep their Latin roots (Na = natrium, K = kalium).