Category:Rubidium

Ru*bid"i*um, n. Etym: [nl., fr. L. rubidus red, fr. rubere to be red. So called from two dark red spectroscopic lines by means of which it Was discovered in the lepidolite from rozena, moravia. See rubicund.] (chem.)

Defn: a rare metallic element. It occurs quite widely, but in small Quantities, and always combined. It is isolated as a soft yellowish White metal, analogous to potassium in most of its properties. Symbol Rb. Atomic weight, 85.2.