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ru·bid·i·um
 rubidium
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- pronunciation:
- ru
bI
di
 m
- features:
- Word Combinations (noun), Word Parts
| part of speech: |
noun |
| definition: |
a highly reactive chemical element of the alkali metal group that has thirty-seven protons in each nucleus, that occurs naturally only in compounds with oxygen and other elements, but that can be isolated as a liquid or very soft solid metal. (symbol: Rb)
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| derivation: |
rubidic (adj.) |
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