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In contrast, the second ionization energy is very high (3052 k J/mol), because removal of two electrons breaks the stable noble gas electronic configuration (the configuration of the inert argon).
Potassium is an extremely active metal that reacts violently with oxygen in water and air.
The latter two species, especially the superoxide, are rare and are formed only in reaction of very electropositive metals (Na, K, Rb, Cs, etc.) with oxygen; these species contain oxygen-oxygen bonds.
All potassium-oxygen binary compounds are known to react with water violently, forming potassium hydroxide.
With oxygen it forms potassium peroxide, and with water potassium forms potassium hydroxide.
The reaction of potassium with water is dangerous because of its violent exothermic character and the production of hydrogen gas.
It is a soft solid with a low melting point, and can be easily cut with a knife.
The transfer of potassium ions through nerve cell membranes is necessary for normal nerve transmission; potassium deficiency and excess can each result in numerous abnormalities, including an abnormal heart rhythm and various electrocardiographic (ECG) abnormalities.which refers to an early method of extracting various potassium salts: placing in a pot the ash of burnt wood or tree leaves, adding water, heating, and evaporating the solution.When Humphry Davy first isolated the pure element using electrolysis in 1807, he named it potassium which he derived from the word potash.Most industrial applications of potassium exploit the high solubility in water of potassium compounds, such as potassium soaps.Heavy crop production rapidly depletes the soil of potassium, and this can be remedied with agricultural fertilizers containing potassium, accounting for 95% of global potassium chemical production.