ru·bid·i·um /ruˈbɪdiəm/
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 ru·bid·i·um /ruˈbɪdɪəm/ 名詞
 銣


 Ru·bid·i·um n.  Chem. A rare metallic element of the alkali metal series, atomic number 37. 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, 85.48.

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 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]


 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.