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| ru·bid·i·um [ roo bíddee əm ] |
noun |
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| Definition: |
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silvery-white radioactive chemical element: a soft silvery white radioactive element of the alkali metal group that reacts strongly with water and bursts into flame when exposed to air. Source: lepidolite, carnallite. Use: photocells.
Symbol Rb
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| [Mid-19th century. < modern Latin< Latin rubidus "red" < rubere "be red" < ruber "red"; from the two red lines in its spectrum] |
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