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Rubidium

//ˌɹuːˈbɪd.i.əm// noun

Definitions

Noun
  1. 1
    The chemical element (symbol Rb) with an atomic number of 37. It is a soft, highly reactive alkali metal. uncountable
  2. 2
    a soft silvery metallic element of the alkali metal group; burns in air and reacts violently in water; occurs in carnallite and lepidolite and pollucite wordnet
  3. 3
    A single atom of this element. countable

Etymology

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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