 rubidium |
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| 1. | [ noun ] (chemistry) 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 | |
| Synonyms: | atomic_number_37 Rb | |
| Related terms: | metallic_element pollucite lepidolite carnallite | |
