Rubidium
Compounds

Rubidium chloride (RbCl) is probably the most used rubidium compound: among several other chlorides, it is used to induce living cells to take up DNA; it is also used as a biomarker, because in nature, it is found only in small quantities in living organisms and when present, replaces potassium. Other common rubidium compounds are the corrosive rubidium hydroxide (RbOH), the starting material for most rubidium-based chemical processes; rubidium carbonate (Rb CO), used in some optical glasses, and rubidium copper sulfate, Rb SO ·CuSO ·6H O. Rubidium silver iodide (RbAg I) has the highest room temperature conductivity of any known ionic crystal, a property exploited in thin film batteries and other applications.

Rubidium forms a number of oxides when exposed to air, including rubidium monoxide (Rb O), Rb O, and Rb O; rubidium in excess oxygen gives the superoxide RbO. Rubidium forms salts with halogens, producing rubidium fluoride, rubidium chloride, rubidium bromide, and rubidium iodide.
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