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METALS
non-METALS
Potassium
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<h1>
Potassium is a chemical element with the symbol K and atomic number 19.
Elemental potassium is a soft silvery-white alkali metal that oxidizes
rapidly in air and is very reactive with water, generating sufficient
heat to ignite hydrogen emitted in the reaction and burning with a lilac
flame. Naturally occurring potassium is composed of three isotopes, one
of which, 40 K, is radioactive. Traces (0.012%) of this isotope are
found in all potassium, making 40 K the most common radioisotope in the
human body and in many biological materials, as well as in common
building substances such as concrete.
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