- noun a soft metallic element, essential to biological life
- A soft silvery-white metallic element whose atomic number is 19. It is an alkali metal, extremely reactive, and oxidizes rapidly or ignites in moist air. It has over 20 known isotopes, of which 2 are stable. Its applications in electronics include its use in high-sensitivity magnetometers, optical devices, and many of its compounds are of significance in this field. Its chemical symbol, K, is taken from the Latin word for alkali: kalium.
- chemical symbolK
- An important mineral essential for health, especially to maintain the fluid balance in the body and the correct working of muscles and nerves. Found in all plant and animal cells.
- noun a metallic element that exists naturally in seawater and in several minerals