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Rubidium is a chemical element; it has symbol Rb and atomic number 37. It is a very soft, whitish-grey solid in the alkali metal group, similar to potassium and caesium. [9] Rubidium is the first alkali metal in the group to have a density higher than water.
Other than 87 Rb, the longest-lived radioisotopes are 83 Rb with a half-life of 86.2 days, 84 Rb with a half-life of 33.1 days, and 86 Rb with a half-life of 18.642 days. All other radioisotopes have half-lives less than a day. 82 Rb is used in some cardiac positron emission tomography scans to assess myocardial perfusion. It has a half-life of ...
Like other alkali metal oxides, Rb 2 O is a strong base. Thus, Rb 2 O reacts exothermically with water to form rubidium hydroxide. Rb 2 O + H 2 O → 2 RbOH. So reactive is Rb 2 O toward water that it is considered hygroscopic. Upon heating, Rb 2 O reacts with hydrogen to rubidium hydroxide and rubidium hydride: [2] Rb 2 O + H 2 → RbOH + RbH
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Rubidium sulfide is an inorganic compound and a salt with the chemical formula Rb 2 S. It is a white solid with similar properties to other alkali metal sulfides . Production
Like other alkali metal hyperoxides, crystals can also be grown in liquid ammonia. [4] Between 280 and 360 °C, Rubidium superoxide will decompose, leaving not rubidium sesquioxide (Rb 2 O 3), but rather rubidium peroxide (Rb 2 O 2). [3] 2 RbO 2 (s) → Rb 2 O 2 (s) + O 2 (g) An even more oxygen rich compound, that of rubidium ozonide (RbO 3 ...
The best performance (in terms of thrust efficiency and power-to-thrust ratio) can be obtained using high atomic weight alkali metals, such as cesium (Cs, 133 amu) and rubidium (Rb, 85.5 amu). These propellants have a low ionization potential (3.87 eV for Cs and 4.16 eV for Rb), low melting point (28.7 °C for Cs and 38.9 °C for Rb) and very ...
The rubidium–strontium dating method (Rb–Sr) is a radiometric dating technique, used by scientists to determine the age of rocks and minerals from their content of specific isotopes of rubidium (87 Rb) and strontium (87 Sr, 86 Sr). One of the two naturally occurring isotopes of rubidium, 87 Rb, decays to 87 Sr with a half-life of 49.