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/ˌɹuːˈbɪd.i.əm/ · noun
(uncountable) The chemical element (symbol Rb) with an atomic number of 37. It is a soft, highly reactive alkali metal..
Use rubidium 82 when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Rubidium 82 means (uncountable) The chemical element (symbol Rb) with an atomic number of 37. It is a soft, highly reactive alkali metal..
Common synonyms include atomic number 37, rb.
The opposite depends on the specific sense.
Use rubidium 82 where its definition matches the intended context.
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