rubidium

(uncountable) The chemical element (symbol Rb) with an atomic number of 37. It is a soft, highly reactive alkali metal.
(countable) A single atom of this element.

atomic number 37

ρουβίδιο

rûbîdyûm

rubidi

A New Latin word derived by German chemist R. W. Bunsen in 1861, from Latin rūbidus (“red”) because its spectrum has two red lines.

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