Chemistry:Rubidium

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Rubidium, 37Rb
Rb5.JPG
Rubidium
Pronunciation/ruːˈbɪdiəm/ ​(roo-BID-ee-əm)
Appearancegrey white
Standard atomic weight Ar, std(Rb)85.4678(3)[1]
Rubidium in the periodic table
Hydrogen Helium
Lithium Beryllium Boron Carbon Nitrogen Oxygen Fluorine Neon
Sodium Magnesium Aluminium Silicon Phosphorus Sulfur Chlorine Argon
Potassium Calcium Scandium Titanium Vanadium Chromium Manganese Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton
Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Silver Cadmium Indium Tin Antimony Tellurium Iodine Xenon
Caesium Barium Lanthanum Cerium Praseodymium Neodymium Promethium Samarium Europium Gadolinium Terbium Dysprosium Holmium Erbium Thulium Ytterbium Lutetium Hafnium Tantalum Tungsten Rhenium Osmium Iridium Platinum Gold Mercury (element) Thallium Lead Bismuth Polonium Astatine Radon
Francium Radium Actinium Thorium Protactinium Uranium Neptunium Plutonium Americium Curium Berkelium Californium Einsteinium Fermium Mendelevium Nobelium Lawrencium Rutherfordium Dubnium Seaborgium Bohrium Hassium Meitnerium Darmstadtium Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson
K
↑
Rb
↓
Cs
krypton ← rubidium → strontium
Atomic number (Z)37
Groupgroup 1: hydrogen and alkali metals
Periodperiod 5
Block  s-block
Element category  s-block
Electron configuration[Kr] 5s1
Electrons per shell2, 8, 18, 8, 1
Physical properties
Phase at STPsolid
Melting point312.45 K ​(39.30 °C, ​102.74 °F)
Boiling point961 K ​(688 °C, ​1270 °F)
Density (near r.t.)1.532 g/cm3
when liquid (at m.p.)1.46 g/cm3
Triple point312.41 K, ​? kPa[2]
Critical point2093 K, 16 MPa (extrapolated)[2]
Heat of fusion2.19 kJ/mol
Heat of vaporization69 kJ/mol
Molar heat capacity31.060 J/(mol·K)
Vapor pressure
P (Pa) 1 10 100 1 k 10 k 100 k
at T (K) 434 486 552 641 769 958
Atomic properties
Oxidation states−1, +1 (a strongly basic oxide)
ElectronegativityPauling scale: 0.82
Ionization energies
  • 1st: 403 kJ/mol
  • 2nd: 2632.1 kJ/mol
  • 3rd: 3859.4 kJ/mol
Atomic radiusempirical: 248 pm
Covalent radius220±9 pm
Van der Waals radius303 pm
Color lines in a spectral range
Spectral lines of rubidium
Other properties
Natural occurrenceprimordial
Crystal structure ​body-centered cubic (bcc)
Body-centered cubic crystal structure for rubidium
Speed of sound thin rod1300 m/s (at 20 °C)
Thermal expansion90 µm/(m·K)[3] (at r.t.)
Thermal conductivity58.2 W/(m·K)
Electrical resistivity128 nΩ·m (at 20 °C)
Magnetic orderingparamagnetic[4]
Magnetic susceptibility+17.0·10−6 cm3/mol (303 K)[5]
Young's modulus2.4 GPa
Bulk modulus2.5 GPa
Mohs hardness0.3
Brinell hardness0.216 MPa
CAS Number7440-17-7
History
DiscoveryRobert Bunsen and Gustav Kirchhoff (1861)
First isolationGeorge de Hevesy
Main isotopes of rubidium
Iso­tope Abun­dance Physics:Half-life (t1/2) Decay mode Pro­duct
83Rb syn 86.2 d ε 83Kr
γ –
84Rb syn 32.9 d ε 84Kr
β+ 84Kr
γ –
β− 84Sr
85Rb 72.17% stable
86Rb syn 18.7 d β− 86Sr
γ –
87Rb 27.83% 4.9×1010 y β− 87Sr
Category Category: Rubidium
view · talk · edit | references
Rb
data m.p. cat
in calc from C diff report ref
C 39.30 — —
K 312.45 312.45 0
F 102.74 102.74 0
max precision 2
WD


input C: 39.30, K: 312.45, F: 102.74
comment
Rb
data b.p. cat
in calc from C diff report ref
C 688 — —
K 961 961 0
F 1270 1270 0
max precision 0
WD


input C: 688, K: 961, F: 1270
comment

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.[6] Rubidium is the first alkali metal in the group to have a density higher than water. On Earth, natural rubidium comprises two isotopes: 72% is a stable isotope 85Rb, and 28% is slightly radioactive 87Rb, with a half-life of 48.8 billion years—more than three times as long as the estimated age of the universe.

German chemists Robert Bunsen and Gustav Kirchhoff discovered rubidium in 1861 by the newly developed technique, flame spectroscopy. The name comes from the Latin word rubidus, meaning deep red, the color of its emission spectrum. Rubidium's compounds have various chemical and electronic applications. Rubidium metal is easily vaporized and has a convenient spectral absorption range, making it a frequent target for laser manipulation of atoms. Rubidium is not a known nutrient for any living organisms. However, rubidium ions have similar properties and the same charge as potassium ions, and are actively taken up and treated by animal cells in similar ways.

Characteristics

Partially molten rubidium metal in an ampoule

Rubidium is a very soft, ductile, silvery-white metal.[7] It is the second most electropositive of the stable alkali metals and melts at a temperature of 39.3 °C (102.7 °F). Like other alkali metals, rubidium metal reacts violently with water. As with potassium (which is slightly less reactive) and caesium (which is slightly more reactive), this reaction is usually vigorous enough to ignite the hydrogen gas it produces. Rubidium has also been reported to ignite spontaneously in air.[7] It forms amalgams with mercury and alloys with gold, iron, caesium, sodium, and potassium, but not lithium (even though rubidium and lithium are in the same group).[8]

Rubidium crystals (silvery) compared to caesium crystals (golden)

Rubidium has a very low ionization energy of only 406 kJ/mol.[9] Rubidium and potassium show a very similar purple color in the flame test, and distinguishing the two elements requires more sophisticated analysis, such as spectroscopy.[citation needed]

Compounds

See also: Category:Rubidium compounds
The ball-and-stick diagram shows two regular octahedra which are connected to each other by one face. All nine vertices of the structure are purple spheres representing rubidium, and at the centre of each octahedron is a small red sphere representing oxygen.
Rb9O2 cluster

Rubidium chloride (RbCl) is probably the most used rubidium compound: among several other chlorides, it is used to induce living cells to take up DNA; it is also used as a biomarker, because in nature, it is found only in small quantities in living organisms and when present, replaces potassium. Other common rubidium compounds are the corrosive rubidium hydroxide (RbOH), the starting material for most rubidium-based chemical processes; rubidium carbonate (Rb2CO3), used in some optical glasses, and rubidium copper sulfate, Rb2SO4·CuSO4·6H2O. Rubidium silver iodide (RbAg4I5) has the highest room temperature conductivity of any known ionic crystal, a property exploited in thin film batteries and other applications.[10][11]

Rubidium forms a number of oxides when exposed to air, including rubidium monoxide (Rb2O), Rb6O, and Rb9O2; rubidium in excess oxygen gives the superoxide RbO2. Rubidium forms salts with halogens, producing rubidium fluoride, rubidium chloride, rubidium bromide, and rubidium iodide.[12]

Isotopes

Main page: Physics:Isotopes of rubidium

Although rubidium is monoisotopic, rubidium in the Earth's crust is composed of two isotopes: the stable 85Rb (72.2%) and the radioactive 87Rb (27.8%).[13] Natural rubidium is radioactive, with specific activity of about 670 Bq/g, enough to significantly expose a photographic film in 110 days.[14][15] Thirty additional rubidium isotopes have been synthesized with half-lives of less than 3 months; most are highly radioactive and have few uses.[16]

Rubidium-87 has a half-life of 48.8×109 years, which is more than three times the age of the universe of (13.799±0.021)×109 years,[17] making it a primordial nuclide. It readily substitutes for potassium in minerals, and is therefore fairly widespread. Rb has been used extensively in dating rocks; 87Rb beta decays to stable 87Sr. During fractional crystallization, Sr tends to concentrate in plagioclase, leaving Rb in the liquid phase. Hence, the Rb/Sr ratio in residual magma may increase over time, and the progressing differentiation results in rocks with elevated Rb/Sr ratios. The highest ratios (10 or more) occur in pegmatites. If the initial amount of Sr is known or can be extrapolated, then the age can be determined by measurement of the Rb and Sr concentrations and of the 87Sr/86Sr ratio. The dates indicate the true age of the minerals only if the rocks have not been subsequently altered (see rubidium–strontium dating).[18][19]

Rubidium-82, one of the element's non-natural isotopes, is produced by electron-capture decay of strontium-82 with a half-life of 25.36 days. With a half-life of 76 seconds, rubidium-82 decays by positron emission to stable krypton-82.[13]

Occurrence

Rubidium is the twenty-third most abundant element in the Earth's crust, roughly as abundant as zinc and rather more common than copper.[20] It occurs naturally in the minerals leucite, pollucite, carnallite, and zinnwaldite, which contain as much as 1% rubidium oxide. Lepidolite contains between 0.3% and 3.5% rubidium, and is the commercial source of the element.[21] Some potassium minerals and potassium chlorides also contain the element in commercially significant quantities.[22]

Seawater contains an average of 125 µg/L of rubidium compared to the much higher value for potassium of 408 mg/L and the much lower value of 0.3 µg/L for caesium.[23] Rubidium is the 18th most abundant element in seawater.[24]

Because of its large ionic radius, rubidium is one of the "incompatible elements".[25] During magma crystallization, rubidium is concentrated together with its heavier analogue caesium in the liquid phase and crystallizes last. Therefore, the largest deposits of rubidium and caesium are zone pegmatite ore bodies formed by this enrichment process. Because rubidium substitutes for potassium in the crystallization of magma, the enrichment is far less effective than that of caesium. Zone pegmatite ore bodies containing mineable quantities of caesium as pollucite or the lithium minerals lepidolite are also a source for rubidium as a by-product.[20]

Two notable sources of rubidium are the rich deposits of pollucite at Bernic Lake, Manitoba, Canada, and the rubicline ((Rb,K)AlSi3O8) found as impurities in pollucite on the Italian island of Elba, with a rubidium content of 17.5%.[26] Both of those deposits are also sources of caesium.[citation needed]

Production

Flame test for rubidium

Although rubidium is more abundant in Earth's crust than caesium, the limited applications and the lack of a mineral rich in rubidium limits the production of rubidium compounds to 2 to 4 tonnes per year.[20] Several methods are available for separating potassium, rubidium, and caesium. The fractional crystallization of a rubidium and caesium alum (Cs,Rb)Al(SO4)2·12H2O yields after 30 subsequent steps pure rubidium alum. Two other methods are reported, the chlorostannate process and the ferrocyanide process.[20][27]

For several years in the 1950s and 1960s, a by-product of potassium production called Alkarb was a main source for rubidium. Alkarb contained 21% rubidium, with the rest being potassium and a small amount of caesium.[28] Today the largest producers of caesium produce rubidium as a by-product from pollucite.[20]

History

Three middle-aged men, with the one in the middle sitting down. All wear long jackets, and the shorter man on the left has a beard.
Gustav Kirchhoff (left) and Robert Bunsen (center) discovered rubidium by spectroscopy. (Henry Enfield Roscoe is on the right.)

Rubidium was discovered in 1861 by Robert Bunsen and Gustav Kirchhoff, in Heidelberg, Germany, in the mineral lepidolite through flame spectroscopy. Because of the bright red lines in its emission spectrum, they chose a name derived from the Latin word rubidus, meaning "deep red".[29][30]

Rubidium is a minor component in lepidolite. Kirchhoff and Bunsen processed 150 kg of a lepidolite containing only 0.24% rubidium monoxide (Rb2O). Both potassium and rubidium form insoluble salts with chloroplatinic acid, but those salts show a slight difference in solubility in hot water. Therefore, the less soluble rubidium hexachloroplatinate (Rb2PtCl6) could be obtained by fractional crystallization. After reduction of the hexachloroplatinate with hydrogen, the process yielded 0.51 grams of rubidium chloride (RbCl) for further studies. Bunsen and Kirchhoff began their first large-scale isolation of caesium and rubidium compounds with 44,000 litres (12,000 US gal) of mineral water, which yielded 7.3 grams of caesium chloride and 9.2 grams of rubidium chloride.[29][30] Rubidium was the second element, shortly after caesium, to be discovered by spectroscopy, just one year after the invention of the spectroscope by Bunsen and Kirchhoff.[31]

The two scientists used the rubidium chloride to estimate that the atomic weight of the new element was 85.36 (the currently accepted value is 85.47).[29] They tried to generate elemental rubidium by electrolysis of molten rubidium chloride, but instead of a metal, they obtained a blue homogeneous substance, which "neither under the naked eye nor under the microscope showed the slightest trace of metallic substance". They presumed that it was a subchloride (Rb2Cl); however, the product was probably a colloidal mixture of the metal and rubidium chloride.[32] In a second attempt to produce metallic rubidium, Bunsen was able to reduce rubidium by heating charred rubidium tartrate. Although the distilled rubidium was pyrophoric, they were able to determine the density and the melting point. The quality of this research in the 1860s can be appraised by the fact that their determined density differs by less than 0.1 g/cm3 and the melting point by less than 1 °C from the presently accepted values.[33]

The slight radioactivity of rubidium was discovered in 1908, but that was before the theory of isotopes was established in 1910, and the low level of activity (half-life greater than 1010 years) made interpretation complicated. The now proven decay of 87Rb to stable 87Sr through beta decay was still under discussion in the late 1940s.[34][35]

Rubidium had minimal industrial value before the 1920s.[36] Since then, the most important use of rubidium is research and development, primarily in chemical and electronic applications. In 1995, rubidium-87 was used to produce a Bose–Einstein condensate,[37] for which the discoverers, Eric Allin Cornell, Carl Edwin Wieman and Wolfgang Ketterle, won the 2001 Nobel Prize in Physics.[38]

Applications

A rubidium fountain atomic clock at the United States Naval Observatory

Rubidium compounds are sometimes used in fireworks to give them a purple color.[39] Rubidium has also been considered for use in a thermoelectric generator using the magnetohydrodynamic principle, whereby hot rubidium ions are passed through a magnetic field.[40] These conduct electricity and act like an armature of a generator, thereby generating an electric current. Rubidium, particularly vaporized 87Rb, is one of the most commonly used atomic species employed for laser cooling and Bose–Einstein condensation. Its desirable features for this application include the ready availability of inexpensive diode laser light at the relevant wavelength and the moderate temperatures required to obtain substantial vapor pressures.[41][42] For cold-atom applications requiring tunable interactions, 85Rb is preferred for its rich Feshbach spectrum.[43]

Rubidium has been used for polarizing 3He, producing volumes of magnetized 3He gas, with the nuclear spins aligned rather than random. Rubidium vapor is optically pumped by a laser, and the polarized Rb polarizes 3He through the hyperfine interaction.[44] Such spin-polarized 3He cells are useful for neutron polarization measurements and for producing polarized neutron beams for other purposes.[45]

The resonant element in atomic clocks utilizes the hyperfine structure of rubidium's energy levels, and rubidium is useful for high-precision timing. It is used as the main component of secondary frequency references (rubidium oscillators) in cell site transmitters and other electronic transmitting, networking, and test equipment. These rubidium standards are often used with GNSS to produce a "primary frequency standard" that has greater accuracy and is less expensive than caesium standards.[46][47] Such rubidium standards are often mass-produced for the telecommunication industry.[48]

Other potential or current uses of rubidium include a working fluid in vapor turbines, as a getter in vacuum tubes, and as a photocell component.[49] Rubidium is also used as an ingredient in special types of glass, in the production of superoxide by burning in oxygen, in the study of potassium ion channels in biology, and as the vapor in atomic magnetometers.[50] In particular, 87Rb is used with other alkali metals in the development of spin-exchange relaxation-free (SERF) magnetometers.[50]

Rubidium-82 is used for positron emission tomography. Rubidium is very similar to potassium, and tissue with high potassium content will also accumulate the radioactive rubidium. One of the main uses is myocardial perfusion imaging. As a result of changes in the blood–brain barrier in brain tumors, rubidium collects more in brain tumors than normal brain tissue, allowing the use of radioisotope rubidium-82 in nuclear medicine to locate and image brain tumors.[51] Rubidium-82 has a very short half-life of 76 seconds, and the production from decay of strontium-82 must be done close to the patient.[52]

Rubidium was tested for the influence on manic depression and depression.[53][54] Dialysis patients suffering from depression show a depletion in rubidium, and therefore a supplementation may help during depression.[55] In some tests the rubidium was administered as rubidium chloride with up to 720 mg per day for 60 days.[56][57]

Rubidium
Hazards
GHS pictograms GHS02: FlammableGHS05: Corrosive
GHS Signal word Danger
H260, H314
P223, P231+232, P280, P305+351+338, P370+378, P422[58]
NFPA 704 (fire diamond)
Flammability code 4: Will rapidly or completely vaporize at normal atmospheric pressure and temperature, or is readily dispersed in air and will burn readily. Flash point below 23 °C (73 °F). E.g. propaneHealth code 3: Short exposure could cause serious temporary or residual injury. E.g. chlorine gasReactivity code 2: Undergoes violent chemical change at elevated temperatures and pressures, reacts violently with water, or may form explosive mixtures with water. E.g. white phosphorusSpecial hazard W: Reacts with water in an unusual or dangerous manner. E.g. sodium, sulfuric acidNFPA 704 four-colored diamond
4
3
2
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Precautions and biological effects

Rubidium reacts violently with water and can cause fires. To ensure safety and purity, this metal is usually kept under dry mineral oil or sealed in glass ampoules in an inert atmosphere. Rubidium forms peroxides on exposure even to a small amount of air diffused into the oil, and storage is subject to similar precautions as the storage of metallic potassium.[59]

Rubidium, like sodium and potassium, almost always has +1 oxidation state when dissolved in water, even in biological contexts. The human body tends to treat Rb+ ions as if they were potassium ions, and therefore concentrates rubidium in the body's intracellular fluid (i.e., inside cells).[60] The ions are not particularly toxic; a 70 kg person contains on average 0.36 g of rubidium, and an increase in this value by 50 to 100 times did not show negative effects in test persons.[61] The biological half-life of rubidium in humans measures 31–46 days.[53] Although a partial substitution of potassium by rubidium is possible, when more than 50% of the potassium in the muscle tissue of rats was replaced with rubidium, the rats died.[62][63]

References

  1. ↑ Meija, Juris; Coplen, Tyler B.; Berglund, Michael; Brand, Willi A.; De Bièvre, Paul; Gröning, Manfred; Holden, Norman E.; Irrgeher, Johanna et al. (2016). "Atomic weights of the elements 2013 (IUPAC Technical Report)". Pure and Applied Chemistry 88 (3): 265–91. doi:10.1515/pac-2015-0305. 
  2. ↑ 2.0 2.1 Haynes, William M., ed (2011). CRC Handbook of Chemistry and Physics (92nd ed.). Boca Raton, FL: CRC Press. p. 4.122. ISBN 1439855110. 
  3. ↑ Cverna, Fran (2002). "Ch. 2 Thermal Expansion". ASM Ready Reference: Thermal properties of metals. ASM International. ISBN 978-0-87170-768-0. http://www.owlnet.rice.edu/~msci301/ThermalExpansion.pdf. 
  4. ↑ Lide, D. R., ed (2005). "Magnetic susceptibility of the elements and inorganic compounds". CRC Handbook of Chemistry and Physics (86th ed.). Boca Raton (FL): CRC Press. ISBN 0-8493-0486-5. https://web.archive.org/web/20110303222309/http://www-d0.fnal.gov/hardware/cal/lvps_info/engineering/elementmagn.pdf. 
  5. ↑ Weast, Robert (1984). CRC, Handbook of Chemistry and Physics. Boca Raton, Florida: Chemical Rubber Company Publishing. pp. E110. ISBN 0-8493-0464-4. 
  6. ↑ Lenk, Winfried; Prinz, Horst; Steinmetz, Anja (2010). "Ullmann's Encyclopedia of Industrial Chemistry". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.a23_473.pub2. 
  7. ↑ 7.0 7.1 Ohly, Julius (1910). "Rubidium". Analysis, detection and commercial value of the rare metals. Mining Science Pub. Co.. https://books.google.com/books?id=dGUuAQAAIAAJ. 
  8. ↑ Holleman, Arnold F.; Wiberg, Egon; Wiberg, Nils (1985). "Vergleichende Übersicht über die Gruppe der Alkalimetalle" (in de). Lehrbuch der Anorganischen Chemie (91–100 ed.). Walter de Gruyter. pp. 953–955. ISBN 978-3-11-007511-3. 
  9. ↑ Moore, John W; Stanitski, Conrad L; Jurs, Peter C (2009). Principles of Chemistry: The Molecular Science. Cengage Learning. p. 259. ISBN 978-0-495-39079-4. https://books.google.com/books?id=ZOm8L9oCwLMC&pg=PA259. 
  10. ↑ Smart, Lesley; Moore, Elaine (1995). "RbAg4I5". Solid state chemistry: an introduction. CRC Press. pp. 176–177. ISBN 978-0-7487-4068-0. https://books.google.com/books?id=pVw98i6gtwMC&pg=PA176. 
  11. ↑ Bradley, J. N.; Greene, P. D. (1967). "Relationship of structure and ionic mobility in solid MAg4I5". Trans. Faraday Soc. 63: 2516. doi:10.1039/TF9676302516. 
  12. ↑ Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 978-0-08-037941-8. 
  13. ↑ 13.0 13.1 Audi, Georges; Bersillon, Olivier; Blachot, Jean; Wapstra, Aaldert Hendrik (2003), "The NUBASE evaluation of nuclear and decay properties", Nuclear Physics A 729: 3–128, doi:10.1016/j.nuclphysa.2003.11.001, Bibcode: 2003NuPhA.729....3A, https://hal.archives-ouvertes.fr/in2p3-00020241/document 
  14. ↑ Strong, W. W. (1909). "On the Possible Radioactivity of Erbium, Potassium and Rubidium". Physical Review. Series I 29 (2): 170–173. doi:10.1103/PhysRevSeriesI.29.170. Bibcode: 1909PhRvI..29..170S. https://zenodo.org/record/1545957. 
  15. ↑ Lide, David R; Frederikse, H. P. R (June 1995). CRC handbook of chemistry and physics: a ready-reference book of chemical and physical data. CRC-Press. pp. 4–25. ISBN 978-0-8493-0476-7. https://books.google.com/books?id=6khCAQAAIAAJ. 
  16. ↑ "Universal Nuclide Chart". nucleonica. http://www.nucleonica.net/unc.aspx. Retrieved 2017-01-03. 
  17. ↑ Planck Collaboration (2016). "Planck 2015 results. XIII. Cosmological parameters (See Table 4 on page 31 of pfd).". Astronomy & Astrophysics 594: A13. doi:10.1051/0004-6361/201525830. Bibcode: 2016A&A...594A..13P. 
  18. ↑ Attendorn, H.-G.; Bowen, Robert (1988). "Rubidium-Strontium Dating". Isotopes in the Earth Sciences. Springer. pp. 162–165. ISBN 978-0-412-53710-3. https://books.google.com/books?id=k90iAnFereYC&pg=PA162. 
  19. ↑ Walther, John Victor (2009). "Rubidium-Strontium Systematics". Essentials of geochemistry. Jones & Bartlett Learning. pp. 383–385. ISBN 978-0-7637-5922-3. https://books.google.com/books?id=cYWNAZbPhMYC&pg=PA383. 
  20. ↑ 20.0 20.1 20.2 20.3 20.4 Butterman, William C.; Brooks, William E.; Reese, Robert G. Jr. (2003). "Mineral Commodity Profile: Rubidium". United States Geological Survey. http://pubs.usgs.gov/of/2003/of03-045/of03-045.pdf. 
  21. ↑ Wise, M. A. (1995). "Trace element chemistry of lithium-rich micas from rare-element granitic pegmatites". Mineralogy and Petrology 55 (13): 203–215. doi:10.1007/BF01162588. Bibcode: 1995MinPe..55..203W. 
  22. ↑ Norton, J. J. (1973). "Lithium, cesium, and rubidium—The rare alkali metals". in Brobst, D. A.. United States mineral resources. Paper 820. U.S. Geological Survey Professional. pp. 365–378. https://pubs.er.usgs.gov/usgspubs/pp/pp820. Retrieved 2010-09-26. 
  23. ↑ Bolter, E.; Turekian, K.; Schutz, D. (1964). "The distribution of rubidium, cesium and barium in the oceans". Geochimica et Cosmochimica Acta 28 (9): 1459. doi:10.1016/0016-7037(64)90161-9. Bibcode: 1964GeCoA..28.1459B. 
  24. ↑ William A. Hart |title=The Chemistry of Lithium, Sodium, Potassium, Rubidium, Caesium, and Francium |page=371
  25. ↑ McSween Jr., Harry Y; Huss, Gary R (2010). Cosmochemistry. Cambridge University Press. p. 224. ISBN 978-0-521-87862-3. https://books.google.com/books?id=385nPZOXmYAC&pg=PA224. 
  26. ↑ Teertstra, David K.; Cerny, Petr; Hawthorne, Frank C.; Pier, Julie; Wang, Lu-Min; Ewing, Rodney C. (1998). "Rubicline, a new feldspar from San Piero in Campo, Elba, Italy". American Mineralogist 83 (11–12 Part 1): 1335–1339. doi:10.2138/am-1998-11-1223. Bibcode: 1998AmMin..83.1335T. 
  27. ↑ bulletin 585. United States. Bureau of Mines. 1995. https://books.google.com/books?id=1ikjAQAAIAAJ&q=ferrocyanide+rubidium. 
  28. ↑ "Cesium and Rubidium Hit Market". Chemical & Engineering News 37 (22): 50–56. 1959. doi:10.1021/cen-v037n022.p050. 
  29. ↑ 29.0 29.1 29.2 Kirchhoff, G.; Bunsen, R. (1861). "Chemische Analyse durch Spectralbeobachtungen". Annalen der Physik und Chemie 189 (7): 337–381. doi:10.1002/andp.18611890702. Bibcode: 1861AnP...189..337K. http://archiv.ub.uni-heidelberg.de/volltextserver/15657/1/spektral.pdf. 
  30. ↑ 30.0 30.1 Weeks, Mary Elvira (1932). "The discovery of the elements. XIII. Some spectroscopic discoveries". Journal of Chemical Education 9 (8): 1413–1434. doi:10.1021/ed009p1413. Bibcode: 1932JChEd...9.1413W. 
  31. ↑ Ritter, Stephen K. (2003). "C&EN: It's Elemental: The Periodic Table – Cesium". American Chemical Society. http://pubs.acs.org/cen/80th/print/rubidium.html. 
  32. ↑ Zsigmondy, Richard (2007). Colloids and the Ultra Microscope. Read books. p. 69. ISBN 978-1-4067-5938-9. https://books.google.com/books?id=Ac2mGhqjgUkC&pg=PAPA69. Retrieved 2010-09-26. 
  33. ↑ Bunsen, R. (1863). "Ueber die Darstellung und die Eigenschaften des Rubidiums". Annalen der Chemie und Pharmacie 125 (3): 367–368. doi:10.1002/jlac.18631250314. https://zenodo.org/record/1427191. 
  34. ↑ Lewis, G. M. (1952). "The natural radioactivity of rubidium". Philosophical Magazine. Series 7 43 (345): 1070–1074. doi:10.1080/14786441008520248. 
  35. ↑ Campbell, N. R.; Wood, A. (1908). "The Radioactivity of Rubidium". Proceedings of the Cambridge Philosophical Society 14: 15. https://archive.org/stream/proceedingsofcam15190810camb/proceedingsofcam15190810camb_djvu.txt. 
  36. ↑ Butterman, W. C.; Reese, R. G. Jr.. "Mineral Commodity Profiles Rubidium". United States Geological Survey. http://pubs.usgs.gov/of/2003/of03-045/of03-045.pdf. 
  37. ↑ "Press Release: The 2001 Nobel Prize in Physics". http://nobelprize.org/nobel_prizes/physics/laureates/2001/press.html. 
  38. ↑ Levi, Barbara Goss (2001). "Cornell, Ketterle, and Wieman Share Nobel Prize for Bose-Einstein Condensates". Physics Today 54 (12): 14–16. doi:10.1063/1.1445529. Bibcode: 2001PhT....54l..14L. 
  39. ↑ Koch, E.-C. (2002). "Special Materials in Pyrotechnics, Part II: Application of Caesium and Rubidium Compounds in Pyrotechnics". Journal Pyrotechnics 15: 9–24. http://www.jpyro.com/wp/?p=179. Retrieved 2010-01-29. 
  40. ↑ Boikess, Robert S; Edelson, Edward (1981). Chemical principles. Harper & Row. p. 193. ISBN 978-0-06-040808-4. https://books.google.com/books?id=59XvAAAAMAAJ&q=%22rubidium%22+%22magnetohydrodynamic%22. 
  41. ↑ Eric Cornell (1996). "Bose-Einstein condensation (all 20 articles)". Journal of Research of the National Institute of Standards and Technology 101 (4): 419–618. doi:10.6028/jres.101.045. PMID 27805098. PMC 4907621. http://nvl.nist.gov/pub/nistpubs/jres/101/4/cnt101-4.htm. Retrieved 2015-09-14. 
  42. ↑ Martin, J. L.; McKenzie, C. R.; Thomas, N. R.; Sharpe, J. C.; Warrington, D. M.; Manson, P. J.; Sandle, W. J.; Wilson, A. C. (1999). "Output coupling of a Bose-Einstein condensate formed in a TOP trap". Journal of Physics B: Atomic, Molecular and Optical Physics 32 (12): 3065. doi:10.1088/0953-4075/32/12/322. Bibcode: 1999JPhB...32.3065M. 
  43. ↑ Chin, Cheng; Grimm, Rudolf; Julienne, Paul; Tiesinga, Eite (2010-04-29). "Feshbach resonances in ultracold gases". Reviews of Modern Physics 82 (2): 1225–1286. doi:10.1103/RevModPhys.82.1225. Bibcode: 2010RvMP...82.1225C. 
  44. ↑ Gentile, T. R.; Chen, W. C.; Jones, G. L.; Babcock, E.; Walker, T. G. (2005). "Polarized 3He spin filters for slow neutron physics". Journal of Research of the National Institute of Standards and Technology 110 (3): 299–304. doi:10.6028/jres.110.043. PMID 27308140. PMC 4849589. http://www.ncnr.nist.gov/equipment/he3nsf/SEOP/nistSlowNeutronconf2005.pdf. Retrieved 2015-08-06. 
  45. ↑ "Neutron spin filters based on polarized helium-3". NIST Center for Neutron Research 2002 Annual Report. http://www.ncnr.nist.gov/AnnualReport/FY2002_html/pages/neutron_spin.htm. 
  46. ↑ Eidson, John C (2006-04-11). "GPS". Measurement, control, and communication using IEEE 1588. Springer. p. 32. ISBN 978-1-84628-250-8. https://books.google.com/books?id=jmfkJYdEANEC&pg=PA32. 
  47. ↑ King, Tim; Newson, Dave (1999-07-31). "Rubidium and crystal oscillators". Data network engineering. Springer. p. 300. ISBN 978-0-7923-8594-3. https://books.google.com/books?id=ttYt5bZqX0AC&pg=PA300. 
  48. ↑ Marton, L. (1977-01-01). "Rubidium Vapor Cell". Advances in electronics and electron physics. Academic Press. ISBN 978-0-12-014644-4. https://books.google.com/books?id=LesrjSVQMPQC&pg=PA72. 
  49. ↑ Mittal (2009). Introduction To Nuclear And Particle Physics. Prentice-Hall Of India Pvt. Limited. p. 274. ISBN 978-81-203-3610-0. https://books.google.com/books?id=GEVt3kpFw64C&pg=PA274. 
  50. ↑ 50.0 50.1 Li, Zhimin; Wakai, Ronald T.; Walker, Thad G. (2006). "Parametric modulation of an atomic magnetometer". Applied Physics Letters 89 (13): 23575531–23575533. doi:10.1063/1.2357553. PMID 22942436. Bibcode: 2006ApPhL..89m4105L. 
  51. ↑ Yen, C. K.; Yano, Y.; Budinger, T. F.; Friedland, R. P.; Derenzo, S. E.; Huesman, R. H.; O'Brien, H. A. (1982). "Brain tumor evaluation using Rb-82 and positron emission tomography". Journal of Nuclear Medicine 23 (6): 532–7. PMID 6281406. 
  52. ↑ Jadvar, H.; Anthony Parker, J. (2005). "Rubidium-82". Clinical PET and PET/CT. Springer. p. 59. ISBN 978-1-85233-838-1. https://books.google.com/books?id=FhkLE8MC71IC&pg=PA59. 
  53. ↑ 53.0 53.1 Paschalis, C.; Jenner, F. A.; Lee, C. R. (1978). "Effects of rubidium chloride on the course of manic-depressive illness". J R Soc Med 71 (9): 343–352. doi:10.1177/014107687807100507. PMID 349155. 
  54. ↑ Malekahmadi, P.; Williams, John A. (1984). "Rubidium in psychiatry: Research implications". Pharmacology Biochemistry and Behavior 21: 49–50. doi:10.1016/0091-3057(84)90162-X. PMID 6522433. 
  55. ↑ Canavese, Caterina; Decostanzi, Ester; Branciforte, Lino; Caropreso, Antonio; Nonnato, Antonello; Sabbioni, Enrico (2001). "Depression in dialysis patients: Rubidium supplementation before other drugs and encouragement?". Kidney International 60 (3): 1201–2. doi:10.1046/j.1523-1755.2001.0600031201.x. PMID 11532118. 
  56. ↑ Lake, James A. (2006). Textbook of Integrative Mental Health Care. New York: Thieme Medical Publishers. pp. 164–165. ISBN 978-1-58890-299-3. https://books.google.com/books?id=Bt5euqMwbpYC&pg=PA165. 
  57. ↑ Torta, R.; Ala, G.; Borio, R.; Cicolin, A.; Costamagna, S.; Fiori, L.; Ravizza, L. (1993). "Rubidium chloride in the treatment of major depression". Minerva Psichiatrica 34 (2): 101–110. PMID 8412574. 
  58. ↑ "Rubidium 276332". https://www.sigmaaldrich.com/catalog/product/aldrich/276332. 
  59. ↑ Martel, Bernard; Cassidy, Keith (2004-07-01). "Rubidium". Chemical risk analysis: a practical handbook. Butterworth-Heinemann. p. 215. ISBN 978-1-903996-65-2. https://books.google.com/books?id=vKBqqiCTB7MC&pg=PA215. 
  60. ↑ Relman, A. S. (1956). "The Physiological Behavior of Rubidium and Cesium in Relation to That of Potassium". The Yale Journal of Biology and Medicine 29 (3): 248–62. PMID 13409924. 
  61. ↑ Fieve, Ronald R.; Meltzer, Herbert L.; Taylor, Reginald M. (1971). "Rubidium chloride ingestion by volunteer subjects: Initial experience". Psychopharmacologia 20 (4): 307–14. doi:10.1007/BF00403562. PMID 5561654. 
  62. ↑ Meltzer, H. L. (1991). "A pharmacokinetic analysis of long-term administration of rubidium chloride". Journal of Clinical Pharmacology 31 (2): 179–84. doi:10.1002/j.1552-4604.1991.tb03704.x. PMID 2010564. http://jcp.sagepub.com/content/31/2/179. 
  63. ↑ Follis, Richard H. Jr. (1943). "Histological effects in rats resulting from adding rubidium or cesium to a diet deficient in potassium". AJP: Legacy Content 138 (2): 246–250. doi:10.1152/ajplegacy.1943.138.2.246. https://journals.physiology.org/doi/abs/10.1152/ajplegacy.1943.138.2.246. 

Further reading

External links

  • Rubidium at The Periodic Table of Videos (University of Nottingham)



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