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nature : I cycle is the main ethnic group (base metal) elements. Atomic number 19. Isotope : 39, 40 / sup>, / sup>, 41. Amu 39.0983. The silvery white metal cereus. Soft. Density 0.856. 63.25 ° C melting point. Boiling Point 765.5 ° C Valence +1. Chemical properties lively. With water or ice, even in the negative 100 ° C also played dramatic reaction, generating hydrogen and potassium hydroxide, while burning. The air oxidation speed. Purple was burning flame. To be stored in kerosene. Guo used in the manufacture of potassium hydroxide, in organic synthesis as reductant, and sodium alloy, the temperature was -12.5 ° C, easy heat transfer, but not curing, the proliferation reactors for heat exchange agent, the system is also used as photocell. Nature in the form of compounds exist, sylvite, saltpeter, carnallite other minerals. Electrolysis may be melting potassium chloride or potassium hydroxide and prepared. Also available molten metal sodium reduction to the system from KCl.
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