- 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 symbol K
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