rubidium /ru·bid·i·um/ (roo-bid´e-um) a chemical element, at. no. 37, symbol Rb.
rubidium (Rb)
rubidium 82 a radioactive isotope of rubidium having a half-life of 1.273 minutes and decaying by positron emission; used as a tracer in positron emission tomography.
ru·bid·i·um (r -b d  - m)n. Symbol Rb A soft metallic element of the alkali group. Atomic number 37. |
rubidium (Rb)
[roo͡bid′ē·əm]
Etymology: L, rubidus, reddish
a soft metallic element of the alkali metals group. Its atomic number is 37, and its atomic mass is 85.47. Slightly radioactive, it is used in radioisotope scanning.
rubidium
a chemical element, atomic number 37, atomic weight 85.47, symbol Rb. See Table 6.
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