noun
- 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: Rb, atomic number 37
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| APA | WordNet. (2010). rubidium. Retrieved September 22, 2026, from http://smartdefine.org/rubidium/definitions/1247687 |
| Chicago | WordNet. 2010. "rubidium" http://smartdefine.org/rubidium/definitions/1247687 (accessed September 22, 2026). |
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| MLA | WordNet. "rubidium" 23 October 2010. Web. 22 September 2026. <http://smartdefine.org/rubidium/definitions/1247687> |