<Li> Rubidium chloride is an excellent non-invasive biomarker . The compound dissolves well in water and readily be taken up by organisms . Once broken in the body, Rb replaces K in tissues because they are from the same chemical group . An example of this is the use of a radioactive isotope to evaluate perfusion of heart muscle . </Li> <Li> Rubidium chloride transformation for competent cells is arguably the compound's most abundant use . Cells treated with a hypotonic solution containing RbCl expand . As a result, the expulsion of membrane proteins allows negatively charged DNA to bind . </Li> <Li> RbCl has been used as an antidepressant in Europe under the trade name Rubinorm in doses ranging from 180 to 720 mg . It increases dopamine and norepinephrine levels and has stimulating effects, hence it is useful for anergic and apathetic depressives . </Li>

What type of bond exist in rubidium chloride