Noun
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 dictionaryAll commercial rubidium frequency standards operate by disciplining a crystal oscillator to the rubidium hyperfine transition of main. Source: Internet
Because rubidium substitutes for potassium in the crystallization of magma, the enrichment is far less effective than that of caesium. Source: Internet
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. Source: Internet
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. Source: Internet
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. Source: Internet
Because of their effect on heart rhythms, however, they are less likely to be used than potassium or rubidium salts. Source: Internet