| NOUN | substance | rubidium, Rb, atomic number 37 | a soft silvery metallic element of the alkali metal group |
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| Meaning | 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. | |
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| Synonyms | Rb, atomic number 37 | |
| Broader | metallic element, metal | Any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc. |
| Substance of | carnallite | A white or reddish mineral consisting of hydrous chlorides / chlorides of potassium and magnesium |
| lepidolite | A mineral of the mica group | |
| pollucite | A rare mineral that is an important source of cesium | |
| Spanish | número atómico 37, Rb, rubidio | |
| Catalan | número atòmic 37, Rb, rubidi | |
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