3 definitions found
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Rubidium \Ru*bid"i*um\, n. [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.)
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.
From WordNet r 1.6 [wn]:
rubidium
n : 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 [syn: {Rb}, {atomic
number 37}]
From Elements database 20001107 [elements]:
rubidium
Symbol: Rb
Atomic number: 37
Atomic weight: 85.47
Soft silvery metallic element, belongs to group 1 of the periodic table.
Rb-97, the naturally occurring isotope, is radioactive. It is highly
reactive, with properties similar to other elements in group 1, like
igniting spontaneously in air. Discovered spectroscopically in 1861 by W.
Bunsen and G.R. Kirchoff
more about rubidium
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