Rubidium

krypton ← rubidium → strontium K ↑ Rb ↓ Cs 37Rb Periodic table
Appearance
grey white
General properties
Name, symbol, number	rubidium, Rb, 37
Pronunciation	/rʉˈbɪdiəm/ roo-bid-ee-əm
Element category	alkali metal
Group, period, block	1, 5, s
Standard atomic weight	85.4678(3)
Electron configuration	[Kr] 5s1
Electrons per shell	2, 8, 18, 8, 1 (Image)
Physical properties
Phase	solid
Density (near r.t.)	1.532 g·cm−3
Liquid density at m.p.	1.46 g·cm−3
Melting point	312.46 K, 39.31 °C, 102.76 °F
Boiling point	961 K, 688 °C, 1270 °F
Critical point	(extrapolated) 2093 K, 16 MPa
Heat of fusion	2.19 kJ·mol−1
Heat of vaporization	75.77 kJ·mol−1
Molar heat capacity	31.060 J·mol−1·K−1
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 (strongly basic oxide)
Electronegativity	0.82 (Pauling scale)
Ionization energies	1st: 403 kJ·mol−1
	2nd: 2632.1 kJ·mol−1
	3rd: 3859.4 kJ·mol−1
Atomic radius	248 pm
Covalent radius	220±9 pm
Van der Waals radius	303 pm
Miscellanea
Crystal structure	body-centered cubic
Magnetic ordering	paramagnetic[1]
Electrical resistivity	(20 °C) 128 nΩ·m
Thermal conductivity	58.2 W·m−1·K−1
Speed of sound (thin rod)	(20 °C) 1300 m·s−1
Young's modulus	2.4 GPa
Bulk modulus	2.5 GPa
Mohs hardness	0.3
Brinell hardness	0.216 MPa
CAS registry number	7440-17-7
Most stable isotopes
Main article: Isotopes of rubidium
iso NA half-life DM DE (MeV) DP 83Rb syn 86.2 d ε - 83Kr γ 0.52, 0.53, 0.55 - 84Rb syn 32.9 d ε - 84Kr β+ 1.66, 0.78 84Kr γ 0.881 - β− 0.892 84Sr 85Rb 72.168% 85Rb is stable with 48 neutrons 86Rb syn 18.65 d β− 1.775 86Sr γ 1.0767 - 87Rb 27.835% 4.88×1010 y β− 0.283 87Sr
v ·  /rʉˈbɪdiəm/ roo-bid-ee-əm) is a chemical element with the symbol Rb and atomic number 37. Rubidium is a soft, silvery-white metallic element of the alkali metal group. Its atomic mass is 85.4678. Elemental rubidium is highly reactive, with properties similar to those of other elements in group 1, such as very rapid oxidation in air. Rubidium has only one stable isotope, 85Rb. The isotope 87Rb, which composes almost 28% of naturally occurring rubidium, is radioactive and has a half-life of 49 billion years—more than three times longer than the estimated age of the universe. German chemists Robert Bunsen and Gustav Kirchhoff discovered rubidium in 1861 by the newly developed method of flame spectroscopy. Its compounds have 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 known to be necessary for any living organisms. However, like caesium, rubidium ions are handled by living organisms in a manner similar to potassium ions: they are actively taken up by plants and living animal cells. Characteristics Rubidium is a very soft, ductile, silvery-white metal.[2] It is the second most electropositive of the non-radioactive alkali metals and melts at a temperature of 39.3 °C (102.7 °F). Similar to other alkali metals, this metal reacts violently with water, forms amalgams with mercury and alloys with gold, iron, caesium, sodium, and potassium, but not lithium (despite the fact that rubidium and lithium are in the same group).[3] 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 liberates. Rubidium has also been reported to ignite spontaneously in air.[2] Rubidium has a very low ionization energy of only 406 kJ/mol.[4] Rubidium and potassium show a very similar violet color in the flame test, which makes spectroscopy methods necessary to distinguish the two elements. Compounds See also Category: Rubidium compounds. Rubidium chloride (RbCl) is probably the most used rubidium compound; it is used in biochemistry to induce cells to take up DNA, and as a biomarker since it is readily taken up to replace potassium, and occurs in only small quantities in living organisms. Other common rubidium compounds are the corrosive rubidium hydroxide (RbOH), the starting material for most rubidium-based chemical processes; rubidium carbonate (RbCO3), which is 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 that is being exploited in thin film batteries and other applications.[5][6] Rubidium has a number of oxides, including rubidium monoxide (Rb2O), Rb6O and Rb9O2, which form if rubidium metal is exposed to air; rubidium in excess oxygen gives the superoxide RbO2. Rubidium forms salts with halides, making rubidium fluoride, rubidium chloride, rubidium bromide and rubidium iodide. Isotopes Main article: Isotopes of rubidium Naturally occurring rubidium is composed of two isotopes: the stable 85Rb (72.2%) and the radioactive 87Rb (27.8%).[7] Natural rubidium is radioactive with specific activity of about 670 Bq/g, enough to significantly expose a photographic film in 110 days.[8][9] Aside from 85Rb and 87Rb, another 24 isotopes are known with half times of under 3 months. Most of them are highly radioactive and have little uses. Rubidium-87 has a half-life of 48.8×109 years, which is more than three times the age of the universe of 13.75 ± 0.11 ×109 years,[10] 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 decays to stable 87Sr by emission of a negative beta particle. During fractional crystallization, Sr tends to become concentrated in plagioclase, leaving Rb in the liquid phase. Hence, the Rb/Sr ratio in residual magma may increase over time, resulting in rocks with elevated Rb/Sr ratios due to progressing differentiation. 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).[11][12] One of the non-natural isotopes rubidium-82 is produced by electron capture decay of Strontium-82 with a half-life of 25.36 days. The subsequent decay of rubidium-82 with a half-life of 76 seconds to stable krypton-82 happens by positron emission.[7] 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.[13] It occurs naturally in the minerals leucite, pollucite, carnallite and zinnwaldite, which contain up to 1% of its oxide. Lepidolite contains between 0.3% and 3.5% rubidium and this is the commercial source of the element.[14] Some potassium minerals and potassium chlorides also contain the element in commercially significant amounts.[15] Sea water 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[16] Because of its large ionic radius, rubidium is one of the "incompatible elements."[17] 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 in the case 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.[13] Two notable sources of rubidium are the rich deposits of pollucite at Bernic Lake, Manitoba. Both of these are also sources of caesium. Rubicline ((Rb,K)AlSi3O8) found as impurities in pollucite on the Italian island of Elba with a rubidium content of 17.5%[18] Production 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.[13] There are several methods to separate 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. Reports of two other methods are given in the literature the chlorostannate process and the ferrocyanide process.[13][19] For several years in the 1950s and 1960s a by-product of the potassium production called Alkarb was a main source for rubidium. Alkarb contained 21% rubidium while the rest was potassium and a small fraction of caesium.[20] Today the largest producers of caesium, for example the Tanco Mine, Manitoba, Canada, produce rubidium as by-product from pollucite.[13] History Rubidium was discovered in 1861 by Robert Bunsen and Gustav Kirchhoff, in Heidelberg, Germany, in the mineral lepidolite through the use of a spectroscope. Because of the bright red lines in its emission spectrum, they chose a name derived from the Latin word rubidus, meaning "dark red".[21][22] Gustav Kirchhoff (left) and Robert Bunsen (center) discovered rubidium spectroscopically. (Also visible is Henry Enfield Roscoe on the right side.) Rubidium is present as a minor component in lepidolite. Kirchhoff and Bunsen processed 150 kg of a lepidolite containing only 0.24% rubidium oxide (Rb2O). Potassium, rubidium form insoluble salts with chloroplatinic acid, but these 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, rubidium could be separated by the difference in solubility of their carbonates in alcohol. This process yielded 0.51 grams of rubidium chloride for further studies. The first large scale isolation of caesium and rubidium compounds, performed from 44,000 liters of mineral water by Bunsen and Kirchhoff, yielded, besides 7.3 grams of caesium chloride, also 9.2 grams of rubidium chloride.[21][22] Rubidium was the second element, shortly after caesium, to be discovered spectroscopically, only one year after the invention of the spectroscope by Bunsen and Kirchhoff.[23] The two scientists used the rubidium chloride thus obtained to estimate the atomic weight of the new element as 85.36 (the currently accepted value is 85.47).[21] They tried to generate elemental rubidium by electrolysis of molten rubidium chloride, but instead of a metal, they obtained a blue homogenous substance which "neither under the naked eye nor under the microscope showed the slightest trace of metallic substance." They assigned it as a subchloride (Rb2Cl); however, the product was probably a colloidal mixture of the metal and rubidium chloride.[24] In a second experiment to produce metallic rubidium Bunsen was able to reduce rubidium by heating charred rubidium tartrate. Although the distilled rubidium was pyrophoric it was possible to determine the density and the melting point of rubidium. The quality of the research done in the 1860s can be appraised by the fact that the determined density differs less than 0.1 g/cm3 and the melting point by less than 1 °C from the presently accepted values.[25] The slight radioactivity of rubidium was discovered in 1908 but before the theory of isotopes was established in the 1910s and the low activity due to the long half-life of above 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.[26][27] Rubidium had minimal industrial value before the 1920s.[28] Since then, the most important use of rubidium has been in research and development, primarily in chemical and electronic applications. In 1995, rubidium-87 was used to produce a Bose-Einstein condensate,[29] for which the discoverers won the 2001 Nobel Prize in Physics.[30] 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.[31] Rubidium has also been considered for use in a thermoelectric generator using the magnetohydrodynamic principle, where rubidium ions are formed by heat at high temperature and passed through a magnetic field.[32] 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.[33][citation needed][34] Rubidium has been used for polarizing 3He, producing volumes of magnetized 3He gas, with the nuclear spins aligned toward a particular direction in space, rather than randomly. Rubidium vapor is optically pumped by a laser and the polarized Rb polarizes 3He through the hyperfine interaction.[35] Spin-polarized 3He cells are becoming popular for neutron polarization measurements and for producing polarized neutron beams for other purposes.[36] Rubidium is the main component of secondary frequency references (rubidium oscillators) to maintain frequency accuracy in cell site transmitters and other electronic transmitting, networking and test equipment. This rubidium standard are often used with GPS to produce a "primary frequency standard" that has greater accuracy and is less expensive than caesium standards.[37][38] Rubidium standards are mass-produced for the telecommunication industry.[39] Other potential or current uses of rubidium include a working fluid in vapor turbines, a getter in vacuum tubes and a photocell component.[40] The resonant element in atomic clocks utilizes the hyperfine structure of rubidium's energy levels.[38] 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 to make atomic magnetometers.[41] In particular, 87Rb is currently being used, with other alkali metals, in the development of spin-exchange relaxation-free (SERF) magnetometers.[41] Rubidium-82 is used for positron emission tomography. Rubidium is very similar to potassium and therefore tissue with high potassium content will also accumulate the radioactive rubidium. One of the main uses is in myocardial perfusion imaging. The very short half-life of 76 seconds makes it necessary to produce the rubidium-82 from decay of strontium-82 close to the patient.[42] As a result of changes in the blood brain barrier in brain tumors, rubidium collects more in brain tumors than normal brain tissue, allowing to use the radioisotope rubidium-82 in nuclear medicine to locate and image brain tumors.[43] Rubidium was tested for the influence on manic depression and depression.[44][45] Dialysis patients suffering from depression show a depletion in rubidium and therefore a supplementation may help during depression.[46] In some tests the rubidium was administered as rubidium chloride with up to 720 mg.[47] Precautions and biological effects Rubidium reacts violently with water and can cause fires. To ensure safety and purity, this metal is kept under a dry mineral oil and is usually sealed in glass ampoules in an inert atmosphere. Rubidium forms peroxides on exposure even to small amount of air diffusing into oil, and is thus subject to similar peroxide precautions as storage of metallic potassium.[48] Rubidium, like sodium and potassium, almost always has +1 oxidation state when dissolved in water, and this includes all biological systems. 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).[49] 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.[50] The biological half-life in humans was measured as 31–46 days.[44] Although a partial substitution of potassium by rubidium is possible, rats with more than 50% of potassium substituted in the muscle tissue died.[51][52] See also References ^ Magnetic susceptibility of the elements and inorganic compounds, in Handbook of Chemistry and Physics 81st edition, CRC press. ^ a b Ohly, Julius (1910). "Rubidium". Analysis, detection and commercial value of the rare metals. Mining Science Pub. Co.. http://books.google.com/?id=dGUuAQAAIAAJ.  ^ Holleman, Arnold F.; Wiberg, Egon; Wiberg, Nils (1985). "Vergleichende Übersicht über die Gruppe der Alkalimetalle" (in German). Lehrbuch der Anorganischen Chemie (91–100 ed.). Walter de Gruyter. pp. 953–955. ISBN 3-11-007511-3.  ^ Moore, John W; Stanitski, Conrad L; Jurs, Peter C (2009-01-21). Principles of Chemistry: The Molecular Science. p. 259. ISBN 9780495390794. http://books.google.de/books?id=ZOm8L9oCwLMC&pg=PA259.  ^ Smart, Lesley; Moore, Elaine (1995). "RbAg4I5". Solid state chemistry: an introduction. CRC Press. pp. 176–177. ISBN 9780748740680. http://books.google.com/?id=pVw98i6gtwMC&pg=PA176.  ^ 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.  ^ a b Audi, Georges (2003). "The NUBASE Evaluation of Nuclear and Decay Properties". Nuclear Physics A (Atomic Mass Data Center) 729 (1): 3–128. Bibcode 2003NuPhA.729....3A. doi:10.1016/j.nuclphysa.2003.11.001.  ^ Strong, W. W. (1909). "On the Possible Radioactivity of Erbium, Potassium and Rubidium". Physical Review (Series I) 29 (2): 170–173. Bibcode 1909PhRvI..29..170S. doi:10.1103/PhysRevSeriesI.29.170.  ^ Lide, David R; Frederikse, H. P. R (1995-06). CRC handbook of chemistry and physics: a ready-reference book of chemical and physical data. pp. 4–25. ISBN 9780849304767. http://books.google.de/books?id=6khCAQAAIAAJ.  ^ "Seven-Year Wilson Microwave Anisotropy Probe (WMAP) Observations: Sky Maps, Systematic Errors, and Basic Results" (PDF). nasa.gov. http://lambda.gsfc.nasa.gov/product/map/dr4/pub_papers/sevenyear/basic_results/wmap_7yr_basic_results.pdf. Retrieved 2011-02-01.  (see p. 39 for a table of best estimates for various cosmological parameters) ^ Attendorn, H. -G.; Bowen, Robert (1988). "Rubidium-Strontium Dating". Isotopes in the Earth Sciences. Springer. pp. 162–165. ISBN 9780412537103. http://books.google.com/?id=k90iAnFereYC&pg=PA162.  ^ Walther, John Victor (1988 2009). "Rubidium-Strontium Systematics". Essentials of geochemistry. Jones & Bartlett Learning. pp. 383–385. ISBN 9780763759223. http://books.google.com/?id=cYWNAZbPhMYC&pg=PA383.  ^ a b c d e Butterman, William C.; Brooks, William E.; Reese, Jr., Robert G. (2003). "Mineral Commodity Profile: Rubidium" (PDF). United States Geological Survey. http://pubs.usgs.gov/of/2003/of03-045/of03-045.pdf. Retrieved 2010-12-04.  ^ Wise, M. A. (1995). "Trace element chemistry of lithium-rich micas from rare-element granitic pegmatites". Mineralogy and Petrology 55 (13): 203–215. Bibcode 1995MinPe..55..203W. doi:10.1007/BF01162588.  ^ Norton, J. J. (1973). "Lithium, cesium, and rubidium—The rare alkali metals". In Brobst, D. A., and Pratt, W. P.. United States mineral resources. Paper 820. U.S. Geological Survey Professional. pp. 365–378. http://pubs.er.usgs.gov/usgspubs/pp/pp820. Retrieved 2010-09-26.  ^ Bolter, E; Turekian, K; Schutz, D (1964). "The distribution of rubidium, cesium and barium in the oceans". Geochimica et Cosmochimica Acta 28 (9): 1459. Bibcode 1964GeCoA..28.1459B. doi:10.1016/0016-7037(64)90161-9.  ^ McSween, Harry Y; Jr,; Huss, Gary R (2010). Cosmochemistry. p. 224. ISBN 9780521878623. http://books.google.com/books?id=385nPZOXmYAC&pg=PA224.  ^ 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. http://ammin.geoscienceworld.org/cgi/content/abstract/83/11-12_Part_1/1335.  ^ bulletin 585. United States. Bureau of Mines. 1995. http://books.google.com/?id=1ikjAQAAIAAJ&q=ferrocyanide+rubidium&dq=ferrocyanide+rubidium.  ^ "Cesium and Rubidium Hit Market". Chemical & Engineering News 37 (22): 50. 1959. doi:10.1021/cen-v037n022.p050.  ^ a b c Kirchhoff,, G.; Bunsen, R. (1861). "Chemische Analyse durch Spectralbeobachtungen". Annalen der Physik und Chemie 189 (7): 337–381. Bibcode 1861AnP...189..337K. doi:10.1002/andp.18611890702.  ^ a b Weeks, Mary Elvira (1932). "The discovery of the elements. XIII. Some spectroscopic discoveries". Journal of Chemical Education 9 (8): 1413–1434. Bibcode 1932JChEd...9.1413W. doi:10.1021/ed009p1413.  ^ 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. Retrieved 2010-02-25.  ^ Zsigmondy, Richard (2007). Colloids and the Ultra Microscope. Read books. p. 69. ISBN 978-1-4067-5938-9. http://books.google.com/books?id=Ac2mGhqjgUkC&pg=PAPA69. Retrieved 2010-09-26.  ^ Bunsen, R. (1863). "Ueber die Darstellung und die Eigenschaften des Rubidiums.". Annalen der Chemie und Pharmacie 125 (3): 367. doi:10.1002/jlac.18631250314.  ^ . doi:10.1080/14786441008520248.  ^ Campell, N. R.; Wood, A. (1908). 14. p. 15.  ^ Butterman, W.C.; Reese, Jr., R.G.. "Mineral Commodity Profiles Rubidium". United States Geological Survey. http://pubs.usgs.gov/of/2003/of03-045/of03-045.pdf. Retrieved 2010-10-13.  ^ "Press Release: The 2001 Nobel Prize in Physics". http://nobelprize.org/nobel_prizes/physics/laureates/2001/press.html. Retrieved 2010-02-01.  ^ Levi, Barbara Goss (2001). "Cornell, Ketterle, and Wieman Share Nobel Prize for Bose-Einstein Condensates". Search & Discovery. Physics Today online. Archived from the original on 2007-10-24. http://web.archive.org/web/20071024134547/http://www.physicstoday.org/pt/vol-54/iss-12/p14.html. Retrieved 2008-01-26.  ^ 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.  ^ Boikess, Robert S; Edelson, Edward (1981). Chemical principles. p. 193. ISBN 9780060408084. http://books.google.com/?id=59XvAAAAMAAJ&q=%22rubidium%22+%22magnetohydrodynamic%22&dq=%22rubidium%22+%22magnetohydrodynamic%22.  ^ . 101. 1996. 419–618. http://nvl.nist.gov/pub/nistpubs/jres/101/4/cnt101-4.htm.  ^ 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.  ^ Gentile, T. R.; Chen, W. C.; Jones, G. L.; Babcock, E.; Walker, T. G.. "Polarized 3He spin filters for slow neutron physics". Journal of Research of the National Institute of Standards and Technology 100: 299–304. http://nvl.nist.gov/pub/nistpubs/jres/110/3/j110-3gen.pdf.  ^ "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. Retrieved 2008-01-11.  ^ Eidson, John C (2006-04-11). "GPS". Measurement, control, and communication using IEEE 1588. p. 32. ISBN 9781846282508. http://books.google.com/books?id=jmfkJYdEANEC&pg=PA32.  ^ a b King, Tim; Newson, Dave (1999-07-31). "Rubidium and crystal oscillators". Data network engineering. p. 300. ISBN 9780792385943. http://books.google.com/books?id=ttYt5bZqX0AC&pg=PA300.  ^ Marton, L (1977-01-01). "Rubidium Vapor Cell". Advances in electronics and electron physics. ISBN 9780120146444. http://books.google.com/books?id=LesrjSVQMPQC&pg=PA72.  ^ Mittal. Introduction To Nuclear And Particle Physics. p. 274. ISBN 9788120336100. http://books.google.com/books?id=GEVt3kpFw64C&pg=PA274.  ^ a b Li, Zhimin; Wakai, Ronald T.; Walker, Thad G. (2006). "Parametric modulation of an atomic magnetometer". Applied Physics Letters 89 (13): 134105. Bibcode 2006ApPhL..89m4105L. doi:10.1063/1.2357553.  ^ Jadvar, H.; Anthony Parker (2005). "Rubidium-82". Clinical PET and PET/CT. p. 59. ISBN 9781852338381. http://books.google.com/books?id=FhkLE8MC71IC&pg=PA59.  ^ Yen, CK; Yano, Y; Budinger, TF; Friedland, RP; Derenzo, SE; Huesman, RH; O'Brien, HA (1982). "Brain tumor evaluation using Rb-82 and positron emission tomography". Journal of Nuclear Medicine 23 (6): 532–7. PMID 6281406.  ^ a b 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. PMC 1436619. PMID 349155. http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=1436619.  ^ Malekahmadi, P; Williams, John A. (1984). "Rubidium in psychiatry: Research implications". Pharmacology Biochemistry and Behavior 21: 49. doi:10.1016/0091-3057(84)90162-X.  ^ 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): 1201–1201. doi:10.1046/j.1523-1755.2001.0600031201.x.  ^ Lake, James A. (2006). Textbook of Integrative Mental Health Care. New York: Thieme Medical Publishers. ISBN 1-58890-299-4. http://books.google.com/?id=Bt5euqMwbpYC&lpg=PA164&pg=PA165#v=onepage&q=.  ^ Martel, Bernard; Cassidy, Keith (2004-07-01). "Rubidium". Chemical risk analysis: a practical handbook. p. 215. ISBN 9781903996652. http://books.google.com/books?id=vKBqqiCTB7MC&pg=PA215.  ^ Relman, AS (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. PMC 2603856. PMID 13409924. http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=2603856.  ^ 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.  ^ Meltzer, HL (1991). "A pharmacokinetic analysis of long-term administration of rubidium chloride". Journal of clinical pharmacology 31 (2): 179–84. PMID 2010564. http://jcp.sagepub.com/content/31/2/179.  ^ Follis, Richard H., Jr. (1943). "Histological Effects in rats resulting from adding Rubidium or Cesium to a diet deficient in potassium". AJP – Legacy 138 (2): 246. http://ajplegacy.physiology.org/cgi/pdf_extract/138/2/246.  Further reading Louis Meites, Handbook of Analytical Chemistry (New York: McGraw-Hill Book Company, 1963) Daniel A. Steck. "Rubidium-87 D Line Data". Los Alamos National Laboratory (technical report LA-UR-03-8638). http://george.ph.utexas.edu/~dsteck/alkalidata/rubidium87numbers.pdf.  Wikimedia Foundation. 2010. Игры ⚽ Поможем написать реферат Religious conversion Ruthenium Look at other dictionaries: Rubidium — Krypton ← Rubidium → Strontium K …   Wikipédia en Français RUBIDIUM — Du latin rubidus , rouge foncé Symbole chimique: Rb Numéro atomique: 37 Masse atomique: 85,47 g Point de fusion: 38,9 0C Point d’ébullition: 688 0C Densité (à 20 0C): 1,53. Métal alcalin mou, d’éclat blanc argenté, découvert par voie… …   Encyclopédie Universelle Rubidium — Rb, Atomgew. 85,5, spez. Gew. 1,52, Schmelzpunkt 38,5; weitverbreitetes Metall, aber stets nur in Spuren meistens neben Kaliumverbindungen vorkommend. Bei der technischen Verarbeitung des Carnallits wird es als Rubidiumalaun gewonnen, aus dem die …   Lexikon der gesamten Technik Rubidium — Ru*bid i*um, n. [NL., fr. L. rubidus red, fr. rubere to be red. So called from two dark red spectroscopic lines by means of which it was discovered in the lepidolite from Rozena, Moravia. See {Rubicund}.] (Chem.) A rare metallic element of the… …   The Collaborative International Dictionary of English Rubidĭum — Rb, Alkalimetall, findet sich in der Natur nicht gediegen, aber in Verbindungen sehr verbreitet als gewöhnlicher Begleiter des Cäsiums und andrer Alkalimetalle. So tritt es, aber stets nur in geringer Menge und als unwesentlicher Bestandteil, im… …   Meyers Großes Konversations-Lexikon Rubidium — Rubidĭum (chem. Zeichen Rb), weit verbreitetes, aber immer nur spurenweise auftretendes Alkalimetall, 1861 von Bunsen entdeckt, findet sich in einigen Mineralien, in Salzsolen, Mineralwässern und in den Abraumsalzen, dem Kalium ähnlich,… …   Kleines Konversations-Lexikon rubidium — Symbol: Rb Atomic number: 37 Atomic weight: 85.47 Soft silvery metallic element, belongs to group 1 of the periodic table. Rb 97, the naturally occurring isotope, is radioactive. It is highly reactive, with properties similar to other elements in …   Elements of periodic system rubidium — [ro͞o bid′ē əm] n. [ModL: so named (1861) by BUNSEN Robert Wilhelm & KIRCHHOFF Gustav Robert < L rubidus, red < ruber,RED (from the red lines in its spectrum) + IUM] a soft, silvery white, metallic chemical element, one of the alkali metals …   English World dictionary rubidium — rubidic, adj. /rooh bid ee euhm/, n. Chem. a silver white, metallic, active element resembling potassium, used in photoelectric cells and radio vacuum tubes. Symbol: Rb; at. wt.: 85.47; at. no.: 37; sp. gr.: 1.53 at 20°C. [1860 65; < NL, equiv.… …   Universalium Rubidium — Eigenschaften …   Deutsch Wikipedia 18+ © Academic, 2000-2024 Contact us: Technical Support, Advertising Dictionaries export, created on PHP, Joomla, Drupal, WordPress, MODx. Mark and share Search through all dictionaries Translate… Search Internet Share the article and excerpts Direct link … Do a right-click on the link above and select “Copy Link”