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rubidium Line breaks: ru¦bid|ium
Pronunciation: /rʊˈbɪdɪəm/

Definition of rubidium in English:


[mass noun]
The chemical element of atomic number 37, a rare soft silvery reactive metal of the alkali metal group. (Symbol: Rb)
Example sentences
  • Those that produce a measurable spectrum when subjected to flame include, but are not limited to, lithium, sodium, potassium, rubidium, cesium, magnesium, calcium, strontium, barium, zinc, and cadmium.
  • These elements - lithium, sodium, potassium, rubidium, cesium and francium - all react with water to give solutions that change the color of a vegetable dye from red to blue.
  • Elements such as rubidium, zirconium, and aluminum are mostly incorporated into human biochemistry as a consequence of their association with essential elements present in the human diet.


Mid 19th century: modern Latin, from Latin rubidus 'red' (with reference to its spectral lines).

Words that rhyme with rubidium

cryptosporidium, cymbidium, idiom, iridium
Definition of rubidium in:
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