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Rubidium is a chemical element with symbol Rb and atomic number 37. Rubidium is a soft, silvery-white metallic element of the alkali metal group, with an atomic mass of 85.4678. Elemental rubidium is highly reactive, with properties similar to those of other alkali metals, such as very rapid oxidation in air.ubidium has a number of oxides, including rubidium monoxide (Rb 2 O), Rb 6 O and Rb 9 O 2, which form if rubidium metal is exposed to air; rubidium in excess oxygen gives the superoxide RbO 2. Rubidium forms salts with halides, making rubidium fluoride, rubidium chloride, rubidium bromide, and rubidium iodide.
The chemical element that bears the symbol K, potassium has an atomic mass of 39.0983 and an atomic number of 19. This alkali metal is soft and has a color of silvery white. It reacts to water and it oxidizes in air. Aside from this, the element can produce enough heat to burn evolved form of hydrogen.