rubidium
Noun
Meaning
A rare metallic element. It occurs quite widely, but in small quantities, and always combined. It is isolated as a soft yellowish white metal, analogous to potassium in most of its properties. Symbol Rb. Atomic weight, 85.2.
Source: Webster's dictionarySynonyms
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Examples
All commercial rubidium frequency standards operate by disciplining a crystal oscillator to the rubidium hyperfine transition of main.
Because rubidium substitutes for potassium in the crystallization of magma, the enrichment is far less effective than that of caesium.
Applications FOCS 1, a caesium atomic clock in Switzerland Lithium, sodium, and potassium have many applications, while rubidium and caesium are very useful in academic contexts but do not have many applications yet.
History Velocity-distribution data (3 views) for a gas of rubidium atoms, confirming the discovery of a new phase of matter, the Bose–Einstein condensate.
A rubidium standard is a secondary standard even though it uses atomic transitions, because it takes the form of a gas cell through which an optical signal is passed.
Because of their effect on heart rhythms, however, they are less likely to be used than potassium or rubidium salts.