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Text File  |  1992-09-02  |  310b  |  9 lines
  1. Element of the alkali group, symbol Rb,
  2. atomic number 37, relative atomic mass 85.48.
  3. It is a soft, white metal which tarnishes
  4. instantly in air and ignites spontaneously.
  5. Discovered spectroscopically by Bunsen and
  6. Kirchoff in the mineral lepidolite, it is
  7. slightly radioactive, and is used as a
  8. photo-sensor.
  9.