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  4. Materials (hierarchy name)
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  6. [materials by composition]
  7. inorganic material
  8. metal
  9. [metal by composition or origin]
  10. nonferrous metal
  11. rubidium
Scope note
Pure metallic element having symbol Rb and atomic number 37; soft, silvery white, and very reactive, rubidium is found as a trace constituent of various alkali minerals. It is used in photoelectric cells and as a catalyst.
Accepted term: 22-Jul-2024