See Also: rubidium(medicine)
rubidium(dictionary)
rubidium radioisotopes(medicine)
rubidium-strontium dating(encyclopedia)

rubidium (iou)



rubidium noun. M19.
[from Latin rubidus red, with ref. to two spectral lines in the red part of the spectrum: see -IUM.]
A soft, silvery-white, highly reactive chemical element, atomic no. 37, belonging to the alkali metal group and found in a few minerals. (Symbol Rb.)
Comb.: rubidium-strontium dating: based on measurement of the relative amounts in rock of rubidium-87 and its beta decay product, strontium-87.